Rod inserter and methods of use

ABSTRACT

The tool and surgical kit are configured to facilitate in-situ reattachment of a screw extender to screw is provided. The surgical kit includes a screw extender, a screw assembly and a tool. The screw extender has a channel extending from a proximal end to a distal end of the screw extender. The screw assembly includes a screw and a set screw. The screw includes a threaded shaft and a head having a pair of sidewalls spaced apart from each. The interior surface of the sidewalls is threaded. The tool includes a first and a second removable shaft, the distal ends of which are configured to respectively engage the screw and the set screw. The tool includes a main shaft, a handle and a hollow housing. The main shaft is configured to fit through the channel, and the hollow housing is configured to receive the screw extender housing.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a divisional application of U.S. patentapplication Ser. No. 13/828,573 filed on Mar. 14, 2013, which in turn isa divisional application of U.S. patent application Ser. No. 12/462,974filed on Aug. 11, 2009 (now U.S. Pat. No. 8,394,109), which in turn is acontinuation-in-part application of U.S. patent application Ser. No.12/290,035 filed on Oct. 23, 2008 (now U.S. Pat. No. 8,469,960) which inturn claims priority to U.S. Provisional Patent Application No.61/132,974 filed Jun. 23, 2008 and claims priority to U.S. ProvisionalPatent Application No. 61/000,263, filed Oct. 23, 2007, all of which areincorporated herein by reference in their entirety. The presentapplication is a divisional application of U.S. patent application Ser.No. 13/828,573 filed on Mar. 14, 2013, which is also acontinuation-in-part of U.S. patent application Ser. No. 12/290,035filed Oct. 23, 2008, which is incorporate herein by reference in itsentirety.

TECHNICAL FIELD

The present invention generally relates to the field of spinal surgery.In particular, the present invention relates to the field of surgicalaccess to the spine.

BACKGROUND

Spinal fusion is a procedure that promotes fusing or growing together oftwo or more vertebrae in the spine. Spinal fusion can be performed to:straighten a spine deformed by scoliosis, neuromuscular disease,cerebral palsy, or other disorder; prevent further deformation; supporta spine weakened by infection or tumor; reduce or prevent pain frompinched or injured nerves; compensate for injured vertebrae or disks.

One of the goals of spinal fusion procedure is to unite two or morevertebrae to prevent them from moving independently of each other. Thismay be done to improve posture, increase ability to ventilate the lungs,prevent pain, or treat spinal instability and reduce the risk of nervedamage. According to the American Academy of Orthopedic Surgeons,approximately a quarter-million spinal fusions are performed each year,half on the upper and half on the lower spine.

The spine is a series of individual bones called vertebrae, separated bycartilaginous disks. The spine includes seven cervical (neck) vertebrae,12 thoracic (chest) vertebrae, five lumbar (lower back) vertebrae, andthe fused vertebrae in the sacrum and coccyx that help to form the hipregion. While the shapes of individual vertebrae differ among theseregions, each is essentially a short hollow tube containing the bundleof nerves known as the spinal cord. Individual nerves, such as thosecarrying messages to the arms or legs, enter and exit the spinal cordthrough gaps between vertebrae. The spinal disks act as shock absorbers,cushioning the spine, and preventing individual bones from contactingeach other. Disks also help to hold the vertebrae together. The weightof the upper body is transferred through the spine to the hips and thelegs. The spine is held upright through the work of the back muscles,which are attached to the vertebrae. While the normal spine has noside-to-side curve, it does have a series of front-to-back curves,giving it a gentle “S” shape. The spine curves in at the lumbar region,back out at the thoracic region, and back in at the cervical region.

One of the types of spinal fusion procedures is a posterior spinalfusion surgery. This procedure is performed posteriorly, or from theback of patient, as opposed to anteriorly, or through the abdomen. Thereare three know posterior fusion techniques (all three are typicallyperformed with pedicle screw fixation). The first is a posterolateralgutter fusion surgery. This type of spinal fusion involves placing bonegraft in the posterolateral portion of the spine (a region just outsidethe back of the spine). The second is a posterior lumbar interbodyfusion (“PLIF”) surgery. A PLIF involves placing bone graft and/orspinal implant (e.g., cage) directly into the disc space in the front ofthe spine. The third is a transforaminal lumbar interbody fusion(“TLIF”) surgery. A TLIF is essentially like an extended PLIF, as italso involves expanding the disc space by removing one entire facetjoint (whereas a PLIF usually involves gaining access to the disc spaceby removing a portion of the facet joints on each side of the spine).

There have been various approaches and systems for performing posteriorspinal surgery. Some conventional systems further include titaniumconstruction that is compatible with current CT and MRI scanningtechnology, low profile implant systems, top-loading and top-tighteningsystems, and other parameters. Some systems also includecross-connectors that allow one-piece implant to be applied to adual-rod construct for a top-loading approach.

The conventional devices and systems have a number of disadvantages.These devices do not provide flexibility when adjusting the deviceseither prior to, during, or after their placement into the patient.Thus, these devices force a surgeon to utilize a specific configuration,leaving very little room for adjustment in accordance with patient'sphysiological characteristics and needs.

In some embodiments, the present invention relates to a minimallyinvasive bone screw placement system that allows a surgeon to implantone or more bone screws into the spine and connect the screws with awire or any other device, wherein the system does not require anyincisions in excess of the bone screw incisions.

SUMMARY OF THE INVENTION

In some embodiments, the present invention is directed to a spinalstabilization system for stabilizing a spine using at least one asurgical screw implant configured to be implanted into the spine. Thesystem includes a housing configured to accommodate placement of thesurgical screw implant, the surgical screw implant is secured to thehousing using a first mating feature in the surgical screw implant, alocking feature contained within the housing and configured to retainthe surgical screw implant for implantation. The first mating feature isconfigured to control axial movement of the surgical screw implant.

In some embodiments, the present invention relates to a method ofstabilizing spine of a patient including implanting a surgical screwimplant having a housing configured to accommodate placement of asurgical screw implant, the surgical screw implant is secured to thehousing using a first mating feature in the surgical screw implant, alocking feature contained within the housing and configured to retainthe surgical screw implant for implantation, wherein the first matingfeature is configured to control axial movement of the surgical screwimplant. The method includes implanting the surgical screw implantcoupled to the housing into a bone, manipulating the surgical screwimplant and the housing to orient the housing in a predetermined manner,advancing a wire through the housing, and using the wire, connecting thesurgical screw implant with another surgical screw implant.

In some embodiments, the present invention relates to a surgicalstabilization system using at least one screw implanted into a bone of apatient, wherein the screw includes a head, wherein the head isconfigured to include a second mating feature that can be configured toinclude a plurality of openings and a plurality of recessed edges. Thesystem includes a hollow housing having a wall surrounding an interiorof the hollow housing, an open proximal end, and an open distal end,wherein the wall is disposed between the proximal end and the distalend. The distal end is secured to the surgical screw and the surgicalscrew is delivered via the proximal end. The housing includes a flexibleportion having a first mating feature disposed along the wall of thehousing and adjacent the distal end. The flexible indenting portion isconfigured to retain the surgical screw within the housing.

In some embodiments, the present invention relates to a surgicalextender apparatus for implanting a surgical screw. The apparatusincludes a housing having a distal end and a proximal end, a hollowinterior passageway disposed between the distal end and the proximalend, a channel disposed along an exterior surface of the housing atleast partially between the distal end and the proximal end andconfigured to at least partially expose the hollow interior passageway,an interior locking mechanism disposed on an interior surface of thehousing and substantially adjacent the proximal end, wherein theinterior locking mechanism is configured to allow attachment of at leastone surgical tool, and at least one flexible member disposedsubstantially adjacent the distal end. The housing is configured toaccommodate placement of a surgical screw implant. The surgical screwimplant is secured to the housing using a mating feature in the surgicalscrew implant. The at least one flexible member is configured to retainthe surgical screw implant. The mating feature is configured to controlaxial movement of the surgical screw implant.

In some embodiments, the present invention relates to a method ofimplanting a surgical screw implant into a bone of a patient using a anextender device having a housing configured to accommodate placement ofa surgical screw implant, the surgical screw implant being secured tothe housing using mating feature in the surgical screw implant, whereinthe housing includes a flexible member contained within the housing andconfigured to retain the surgical screw implant. The method includesimplanting the surgical screw implant into a bone of the patient,attaching the screw extender device to the surgical screw and, insertinga screw locking device along the long axis of the screw extender.

In some embodiments, the present invention relates to a surgical kit forstabilizing the spine of a patient. The kit includes a screw extenderconfigured to be coupled to a surgical screw, wherein the screw extenderincludes a housing having a distal end and a proximal end, a hollowinterior passageway disposed between the distal end and the proximalend, a channel disposed along an exterior surface of the housing atleast partially between the distal end and the proximal end andconfigured to at least partially expose the hollow interior passageway,an interior locking mechanism disposed on an interior surface of thehousing and substantially adjacent the proximal end, wherein theinterior locking mechanism is configured to allow attachment of at leastone surgical tool, and at least one flexible member disposedsubstantially adjacent the distal end. The housing is configured toaccommodate placement of a surgical screw implant. The surgical screwimplant is secured to the housing using a mating feature in the surgicalscrew implant. The flexible members are configured to retain thesurgical screw implant. The mating feature is configured to controlaxial movement of the surgical screw implant.

In some embodiments, the present invention relates to adistraction/compression tool for use with a screw extender system havingat least two hollow screw extender housings configured to be coupled torespective screw assemblies implanted into vertebrae. The tool includesa housing having a first screw extender holding portion, a second screwextender holding portion pivotally coupled to the first screw extenderholding portion, each screw extender holding portion includes a baseconfigured to hold a screw extender housing, a multi-directionalthreading mechanism configured to secure bases of the screw extenderholding portion. Rotation of the threading mechanism in one directioncauses distraction of the screw extender housings coupled to the basesand rotation of the threading mechanism in another direction causescompression of the screw extender housings.

In some embodiments, the present invention relates to a method forcompressing/distracting screw extender system using the abovedistraction/compression tool, wherein the screw extender system includesat least two hollow screw extender housings configured to be coupled torespective screw assemblies implanted into vertebrae. The methodincludes rotating the threading mechanism to compress/distract screwextender housings.

In some embodiments, the present invention relates to a rod insertertool for use with a hollow screw extender housing configured to becoupled to a screw assembly implanted into vertebrae. The tool includesa handle coupled to a curved shaft at a proximal end of the curvedshaft. The shaft includes a static shaft portion configured to bepermanently coupled to the handle, a sliding shaft portion configured tobe slidably coupled inside the handle and further configured to slidealong the static shaft portion, a rod holding mechanism formed by thestatic shaft portion and a sliding shaft portion and configured to bedisposed at a distal end of the curved shaft. By translating the slidingshaft portion along the static shaft portion toward the distal end ofthe shaft, the rod holding mechanism is configured to secure a rod.

In some embodiments, the present invention relates to a method forinserting a rod using the above rod inserter tool in combination with ahollow screw extender housing configured to be coupled to a screwassembly implanted into vertebrae. The method includes securing the rodin the rod holding mechanism, and advancing the secured rod using therod inserter tool through the screw extender housing and toward thecorresponding screw assembly.

In some embodiments, the present invention relates to a re-attachmentguide tool for re-attaching a hollow screw extender housing, having atleast one open channel disposed in a wall of the screw extender housing,to a screw assembly implanted into a vertebrae. The tool includes atleast one guide shaft configured to be coupled to a screw assembly, amain assembly having a handle coupled to a flat shaft at a proximal endof the flat shaft, a hollow housing coupled to the flat shaft at adistal end of the flat shaft and configured to accommodate insertion ofthe screw extender housing, and a hollow interior disposed inside thehandle and the flat shaft and configured to accommodate insertion of theat least one guide shaft. The flat shaft is configured to have apredetermined thickness that allows coupling of the screw extenderhousing using the at least one open channel in the screw extenderhousing.

In some embodiments, the present invention relates to a method forre-attachment of a hollow screw extender housing to a screw assemblyimplanted into a vertebrae using the above re-attachment guide tool,wherein the hollow screw extender housing includes at least one openchannel disposed in a wall of the screw extender housing. The methodincludes coupling the at least one guide shaft to the screw assembly,placing the main assembly over the at least one guide shaft, securingthe main assembly to the screw assembly, coupling the screw extenderhousing to the flat shaft of the main assembly, translating the screwextender housing toward the distal end of the flat shaft, and,re-attaching the screw extender housing to the screw assembly.

In some embodiments, the present invention relates to a rod reducer toolfor use with a screw extender housing secured to a screw assemblyimplanted into a vertebrae. The tool includes a hollow shaft having aproximal and a distal end and configured to accommodate insertion of thescrew extender housing, a rotating handle coupled to the hollow shaft atthe proximal end of the hollow shaft, a first threading mechanismdisposed inside the handle, a second threading mechanism coupled to thehandle and disposed inside the hollow shaft for coupling to the screwextender housing. The first threading mechanism is configured to allowindependent rotation of the handle with respect to the hollow shaft.Rotation of the handle is configured to translate the hollow shaft alongthe screw extender housing that has been inserted into the hollow shaftthrough interaction of the second threading mechanism with a threadingmechanism disposed on the screw extender housing.

In some embodiments, the present invention relates to a method forreducing a rod using the above rod reducer tool used in connection witha screw extender housing secured to a screw assembly implanted into avertebrae. The method includes inserting the screw extender housinginside the hollow shaft, translating the rod reducer tool along thescrew extender housing toward the screw assembly, and rotating therotating handle to advance the rod reducer tool toward the screwassembly, thereby reducing the rod.

In some embodiments, the present invention relates to a screw extenderremoval tool for removing a screw extender housing having flexibleportions disposed at a distal end of the screw extender housing, whereinthe screw extender housing is coupled to a screw assembly. The toolincludes an external shaft having a proximal end and a distal end,wherein a plurality of protrusions are disposed on an external surfaceat the distal end of the external shaft, the external shaft having aninternal shaft disposed in a hollow interior of the external shaft, ahandle coupled to the proximal end of the shaft, wherein the handleincludes a spring-loaded mechanism pivotally coupled to the internalshaft. Upon actuation of the spring-loaded mechanism, the internal shaftis translated in the hollow interior of the external shaft to extendbeyond the distal end of the external shaft. The external shaft isconfigured to be inserted into the screw extender housing coupled to thescrew assembly. Then, using the handle, rotated to push apart theflexible portions of the screw extender housing. Upon actuation of thespring loaded mechanism, further configured to extend the internal shaftbeyond the distal end of the external shaft in order to remove the screwextender housing from the screw assembly.

In some embodiments, the present invention relates to a method forremoving a screw extender housing from a screw assembly using the abovescrew extender removal tool, wherein the screw extender housing includesflexible portions disposed at a distal end of the screw extender housingand the screw extender housing is coupled to a screw assembly. Themethod includes inserting the screw extender remover tool into the screwextender housing coupled to the screw assembly, using the handle,rotating the screw extender remover tool to push apart the flexibleportions of the screw extender housing using the plurality ofprotrusions, and upon actuation of the spring loaded mechanism,extending the internal shaft beyond the distal end of the externalshaft, and, removing the screw extender housing from the screw assembly.

In some embodiments, the present invention relates to a rod insertertool for use with a hollow screw extender housing configured to becoupled to a screw assembly implanted into vertebrae. The tool includesa handle, a main housing configured to include a rod holding mechanismadjacent to a distal end of the main housing for holding a rod, whereinthe handle is coupled to the main housing adjacent to a proximal end ofthe main housing, a secondary housing configured to be slidably disposedalong the main housing and further configured to secure the rod to thedistal end of the main housing, and a lateral housing configured to beslidably disposed along the main housing and further configured tochange orientation of the rod upon being actuated by the handle.

In some embodiments, the present invention relates to a method ofinserting a rod using a rod inserter tool described above in combinationwith a hollow screw extender housing configured to be coupled to a screwassembly implanted into vertebrae. The method includes coupling the rodto the distal end of the main housing of the rod inserter tool,advancing the rod toward the screw assembly implanted into vertebraealong the screw extender housing coupled to the screw assembly, securingto rod to the screw assembly, and releasing the rod from the rodinserter tool.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is described with reference to the accompanyingdrawings. In the drawings, like reference numbers indicate identical orfunctionally similar elements.

FIGS. 1a-c illustrate an exemplary screw extender system, according tosome embodiments of the present invention.

FIGS. 2a-b illustrate another exemplary screw extender system, accordingto some embodiments of the present invention.

FIGS. 3a-d illustrate yet another exemplary screw extender system,according to some embodiments of the present invention.

FIGS. 4a-b illustrate an exemplary screw for use with a screw extendersystem, according to some embodiments of the present invention.

FIG. 5 illustrates exemplary coupling of the screw and the screwextender system, according to some embodiments of the present invention.

FIG. 6 illustrates a distal portion of the screw extender housing,according to some embodiments of the present invention.

FIGS. 7a-b are bottom views of the screw extender housing having anexemplary screw remover device configured to remove the housing from theimplanted screw, according to some embodiments of the present invention.

FIGS. 8a-d illustrate various exemplary screw extender remover tools,according to some embodiments of the present invention.

FIGS. 9a-h illustrate exemplary percutaneous wire inserters for use withscrew extender system, according to some embodiments of the presentinvention.

FIGS. 10a-h illustrate an exemplary step-by-step procedure forpercutaneously inserting a wire using a screw extender system, accordingto some embodiments of the present invention.

FIGS. 11a-b illustrate an exemplary wire advancement mechanism,according to some embodiments of the present invention.

FIG. 12 illustrates an exemplary wire, according to some embodiments ofthe present invention.

FIGS. 13a-f illustrate an exemplary compressor/distractor tool,according to some embodiments of the present invention.

FIGS. 14a-e illustrate another exemplary compressor/distractor tool,according to some embodiments of the present invention.

FIG. 15 illustrates an exemplary anti-splay device, according to someembodiments of the present invention.

FIGS. 16a-c illustrate an exemplary caliper tool, according to someembodiments of the present invention.

FIGS. 17a-c illustrate an exemplary screw extender guide tool, accordingto some embodiments of the present invention.

FIGS. 18a-c illustrate an exemplary supplemental screw extender removertool, according to some embodiments of the present invention.

FIGS. 19a-f illustrate various exemplary rod inserter tools, accordingto some embodiments of the present invention.

FIGS. 20a-o illustrate exemplary step-by-step procedures for insertionof a rod using rod inserter tools, according to some embodiments of thepresent invention.

FIGS. 21a-e illustrate an exemplary rod reducer tool, according to someembodiments of the present invention.

FIGS. 22a-b illustrate an exemplary rod inserter tool, according to someembodiments of the present invention.

FIGS. 23a-i illustrate an exemplary compression-distraction tool,according to some embodiments of the present invention.

FIGS. 24a-l illustrate an exemplary end-holding rod inserter tool,according to some embodiments of the present invention.

FIGS. 25a-e illustrate an exemplary percutaneous end-holding rodinserter tool, according to some embodiments of the present invention.

FIGS. 26a-k illustrate an exemplary in-situ re-attachment guide tool,according to some embodiments of the present invention.

FIGS. 27a-i illustrate an exemplary rod reducer tool, according to someembodiments of the present invention.

FIGS. 28a-e illustrate an exemplary screw extender remover tool,according to some embodiments of the present invention.

FIGS. 29a-f illustrate an exemplary rod inserter tool, according to someembodiments of the present invention.

FIG. 30 illustrates a conventional rod caliper tool for measuring lengthof a rod.

FIG. 31 illustrates a conventional T-handle torque wrench with a torquewrench shaft for final-tightening of a setscrew within a screw assembly.

DETAILED DESCRIPTION OF THE INVENTION

In some embodiments, the present invention allows a surgeon usingconventional stab wounds to place bone screws. This is typicallyaccomplished using a Jamshiti needle followed by progressive dilation.Once the bone has been prepared, the bone screw is implanted.

After implantation, the bone screw is manipulated for orientation by theextender. This “extender” extends out of the stab wound and allows thesurgeon to control the implanted screw. Once two or more screws areimplanted, the surgeon will place the wire inserters onto the screwextender. The wire components are designed to guide a wire down the axisof the screw extender. Once the desired depth is reached, the wire willexit out of the screw extender and puncture the muscle and create a pathto join the adjacent bone screw.

Once the wire bridges the gap between the screws, an instrument that hasbeen previously placed down the adjacent extender grabs the wire andpulls the distal portion of the wire to the surface. Attached to theproximal portion of the wire is a rod. By pulling on the distal portionof the wire, the rod is drawn down the extender and pulled across thegap between the screws. The “button” feature on the proximal portion ofthe rod prevents the rod from being overly pulled past the extender. Insome embodiments, the extenders along with screws and the wire insertersare disposed at the surgical site prior to advancement of the wire.

Set screws can be placed, final tightened and the guide wire can beremoved. This provides a minimally invasive placement of fusionhardware.

FIGS. 1a-c illustrate an exemplary embodiment of a screw extender device100, according to some embodiments of the present invention. FIG. 1aillustrates the screw extender device 100 being coupled to a screw. FIG.1b illustrate the screw extender device 100 by itself and FIG. 1cillustrates a cross-sectional cut out of the screw extender device shownin FIG. 1b . Screw extender device 100 includes a housing 110 that iscoupled to a screw implant 120 using first mating features (or as shownin FIGS. 1a-c , the indented features) 105 disposed on the head of thescrew 122. The indented features 105 are configured to control axial andtorsional movement. The housing 110 has a proximal end 102 and a distalend 104. The housing 110 further includes a partially open channel 112,which permits insertion and passage of a rod toward from the proximalend 102 toward the distal end 104 of the housing 110. In someembodiments, as will be discussed below, the housing 110 can beconfigured to include a partially open channel 112 and/or a fully openchannel, whereby the fully open channel is configured to stretch fromthe proximal end 102 to the distal end 104. The open channel isconfigured as a hollow interior or passageway 119 of the housing 110.The hollow interior 119 is configured to allow passage of instruments,rods, implants, etc. through the screw extender device during surgery.To allow such passage, the housing 110 includes an opening 108 disposedat the proximal end 102 and a similar opening disposed at the distal end104. The sizes of the openings can be substantially similar to the sizeof the interior 119. The openings allow passages of instruments, tools,rods, implants, etc. during surgical procedures. In some embodiments,the screw extender housing 110 is configured to have a cylindricalshape. As can be understood by one skilled in the art, other shapes ofthe housing 110 are possible.

The distal end 104 of the housing 110 is configured to be coupled to thehead of the screw 122. The distal end 104 includes second matingfeatures (as shown in FIGS. 1a-c , protrusions) 115 (as shown in FIGS.1b-c ) that are configured to mate with the first (or indented) features(or openings) 105 disposed on the head of the screw 122. In thefollowing description of FIGS. 1a-22b , the terms “protrusion(s)”,“indentation(s)”, “first mating feature(s)”, “second mating feature(s)”will be used interchangeably, and thus, in some embodiments, the presentinvention can include a first mating feature that is a protrusion and asecond mating feature that is an indentation configured to mate with theprotrusions, whereas in some embodiments, a first mating feature can bean indentation and a second mating feature can be a protrusion withwhich the first mating feature mates. Hence, the terms “protrusion(s)”and “indentation(s)” are to mean “indentation(s) or protrusion(s)” areto be interpreted as such. Further, the terms “protrusion(s)” and“indentation(s)” are used in this description for illustrativenon-limiting purposes only. The protrusions 115 are configured to flexas the screw 120 (a portion 117 of the screw is shown in FIGS. 1a-c ) iscoupled to the extender housing 110. In some embodiments, protrusions115 are configured to be spring-loaded or otherwise be any lockingfeature, wherein upon insertion of the screw, the protrusions 115 areconfigured to retract toward the interior wall of the extender housing110 and then protract toward the indented features 105 upon protrusions115 being aligned with the features 105. Upon coupling, the protrusions115 are configured to snap into indented features 105, thereby lockingthe screw to the screw extender housing 110 and creating a rigidstructure. The interior walls of the housing 110 can further configuredto include threading 131 disposed near the proximal end 104. Thethreading 131 is configured to allow securing of various tools to theextender housing 110 during surgical procedures. As can be furtherunderstood by one skilled in the art, the terms “threading” or “thread”are used in this description of FIGS. 1a-22c for exemplary non-limitingpurposes and instead of threading components together, other means ofcompression and/or distraction and/or other ways of coupling can beused.

In some embodiments, the screw 120 can be a poly-axial screw that allowsa surgeon to manipulate (rotate, tilt, etc.) the combination of thescrew 120 coupled to the housing 110 once the screw is implanted into abony matter (e.g., vertebrae) of the patient. The screw 120 furtherincludes threading 124 on a threaded shaft of the screw that isconfigured to assist in insertion of the screw into a bony matter. Thethreaded shaft is coupled to the head of the screw 122. The head of thescrew 122 includes a passageway 126 that is configured to be wide enoughto accommodate placement and securing of a rod. The passageway 126 isconfigured to be aligned with the channel 112 so as to create acontinuous channel between the screw and the screw extender. In someembodiments, the passageway 126 can be configured to include threading138 disposed on passageway's interior surfaces. The threading 138 allowsplacement of set screws (not shown in FIGS. 1a-c ) to secure a rod onceit is installed into the screw.

FIGS. 2a-b illustrate another exemplary screw extender system 200,according to some embodiments of the present invention. FIG. 2aillustrates the screw extender housing being coupled to the screw andFIG. 2b illustrates the screw extender housing being uncoupled from thescrew. As shown in FIGS. 2a-b , a screw 220 is configured to be coupledto a screw extender housing 210. The screw extender housing 210 isconfigured to be an elongated tube that includes openings at both of itsends 202 (proximal), 204 (distal) for coupling to the screw 220 at oneend 204 and for insertion of surgical instruments at the other end 202.The housing 210 further includes slots or channels 212 that extend alongat least a portion of the housing 210 and are further configured toaccommodate placements of rod(s). Additionally, the housing 210 furtherincludes indentor portions or screw-locking features 240, which areconfigured to secure the screw 220 to the screw extender device housing210. In some embodiments, the housing 210 includes two indentor portions240 (second portion is not shown in FIG. 2a ). The indentor portions 240are configured to be fixed to the housing 210 at a location 237, whichis disposed toward the screw-coupling end 204. In some embodiments, theindentor portions 240 are configured to be welded at a location 237.Once the screw 220 is loaded into the extender device (See, FIG. 2a ),the indentor portions 240 are configured to engage the screw 220 usingprotrusions 242 that are disposed on an interior wall of the indentorportions 240 and are further configured to protrude into the interior ofthe housing 210. In some embodiments, the indentor portions 240 areconfigured to be flexible.

The indentor portions 240 are configured to engage an opening 251 in thehead of the screw 220, as shown in FIG. 2b . Upon insertion of the screw220 into the extender device housing 210, the indentor portions 240 areconfigured to spread apart from the center of the housing 210. In someembodiments, the indentor portions 240 are configured to be spring-likedevices that pull apart upon application of external mechanicalpressure. Once the screw 220 is inserted into the housing 210, theindentor portions 240 are configured to snap into openings 251 of thescrew 220. Upon snapping into openings 251, the indentor portions 240rigidly secure the screw 220 to the housing 210.

Similarly to the screw extender shown in FIGS. 1a-c , the screw extenderhousing 210 includes an interior passageway 219 that is configured to beexposed by the channel 212 (either fully or partially stretching alongthe length of the housing 210). The channel 212 is configured to bealigned with a passageway 226 disposed on the head of the screw 222 soas to create a continuous channel between the between the channel 212and the passageway 226 for passing of tools, instruments, rods, etc.

FIGS. 3a-c illustrate another exemplary screw extender housing 310,according to some embodiments of the present invention. The extenderhousing 310 includes two channels 312 and 332 that are configured toexpose the interior 319 of the screw extender housing 310. The channel312 is configured to be partially open (i.e., partially stretch outbetween proximal and distal ends) and channel 332 is configured to befully open (i.e., connect the proximal and distal ends), as illustratedin FIGS. 3b and 3c , wherein FIG. 3c is a top cross-sectional view ofthe extender housing 310. The housing 310 further includes a grippingfeature (or features) 391 that is configured to be disposed along edgesof the channel 312 and/or channel 332, as shown in FIGS. 3a-b . Thegripping feature 391 is configured to assist in providing additionalsupport to the distractor/compressor device shown in FIGS. 14a-e anddiscussed below. In some embodiments, the gripping feature 391 isconfigured to form a small cavity disposed along edges of the channels.In some embodiments, the gripping features 391 can have a shape of asemi-circular cavity. The gripping features 391 can be configured to bedisposed along the entire length of the channels 312 and/or 332 or alonga portion of the channels.

Similarly to the screw extenders shown in FIGS. 1a-2b , the screwextender housing 300 can include interior threads 331 disposed adjacentthe proximal end 302 of the screw extender housing 300. The screwextender housing 310 further includes a locking feature 340 disposedtoward the distal end 304 for interlocking with a screw in a similarfashion as the screw extender shown in FIGS. 2a -b.

FIG. 3d is a cross-sectional view of a portion of the distal end 304 ofthe screw extender housing 310. FIG. 3d further illustrates in thelocking feature 340 having a protrusion 371 that is configured to matewith an opening disposed on a head of the screw (not shown in FIG. 3d ),similar to the feature 240 shown in FIGS. 2a-c . The locking feature 340further includes a stopping mechanism 379 that is configured to preventa screw extender removal tool (shown in FIGS. 8a-8d and discussed below)from over rotating once it is placed inside the screw extender housing'sinterior for the purposes of removing the screw extender housing fromthe screw. In some embodiments, the stopping mechanism 379 is configuredto prevent rotation of the screw extender removal tool by more than 90degrees. As can be understood by one skilled in the art, the stoppingmechanism can prevent any angle of rotation.

As can be understood by one skilled in the art, the channels formed bythe screw extender housing channels and the screw do not need to becontinuous. For example, a channel on the extender housing can havemultiple discontinuities disposed throughout the housing. As can be alsounderstood by one skilled in the art, the screw extender housing can beconfigured to include one or more first mating features (or indentors,or indented features, or indentor portions, etc.) upon release of one ofthem, the extender housing can be configured to disengage from thescrew.

FIG. 4a-b illustrate an exemplary screw 400 configured to be used withscrew extenders shown in FIGS. 1a-3d and discussed above, according tosome embodiments of the present invention. The screw 400 includes adistal end 404, a proximal end 402, a shaft 421 having threads 424disposed along its length, and a head of the screw 408 coupled to theshaft 421. The head of the screw includes a passageway 426 that is sizedand configured to accommodate placement and securing of a rod. To securethe rod inside the screw head 408, the rod is placed into an interiorspace 425 created by the passageway 426 and then a set screw (not shown)is placed on top of the rod and secured using threads 415 disposed onthe interior walls of the passageway 426. The passageway 426 can beconfigured to include recessed edges 420 (a, b, c, d) that areconfigured to accommodate placement of the screw extender housing (shownin FIG. 5). The head of the screw further includes openings 410 that areconfigured to receive protrusions of the locking features disposed onthe screw extender housing (as shown in FIGS. 2a-3b ).

Referring to FIG. 5, to further secure the screw 500 (similar to thescrew 400) to the extender device housing 512, the housing 512 includesa plurality of protrusions 510 (a, b, c, d). The protrusions 510 areconfigured to engage recessed edges 509 (a, b, c, d), respectively, ofthe head 528 of the screw 514. In some embodiments, the protrusions 510are configured to wrap around the recessed edges 509. Such interactionof screw's recessed edges 509 and extender's protrusions 510 furthersecures the screw 514 to the extender housing 512 and preventsdisplacement of the screw 514 from the housing 512. This configurationalso allows the surgeon (or any other medical professional) tocontrollably apply various forces to the screw (e.g., during placementof an implant, etc.), such translational, axial, torsional, or any otherforces. As can be understood by one skilled in the art, the screw 514and the housing 512 can have any number of recessed edges 509 andcorresponding protrusions 510. Additionally, the screw 514 can have anynumber of openings (not shown in FIG. 5, but shown in FIGS. 4a-b ) andthe housing 512 can have any number of corresponding indentor portions540 that interact with the openings.

As stated above, the screw extender aids in the placement of, forexample, pedicle screws during spinal fusion procedures. In someembodiments, the surgeon (or other medical professional) attaches thescrew extender to the pedicle screw and maintains control of the screwfrom an exterior (for example, from outside of the skin incision). Thescrew extender provides strong attachment so that axial, lateral, andtorsional forces can be applied to the screw extender. The surgeontypically applies these forces to screw extenders to manipulate thevertebra to which pedicle screws are attached.

In some embodiments, the screw extender has a center-less tubular body.The extender includes various securing features, for example, flexibleindenters, for holding the screw in an axial plane along the axis of thescrew and the extender, where the securing features engage the recessededges of the screw. In some embodiments, the screw extender indentersare flexible and are fixed to the main body of the screw extender atonly one location (as shown in FIG. 3a ). This allows the screw extenderindenters to flex out of the way and allow the screw to be released fromthe screw extender. As stated above, extender's tubular body is alsopartially slotted to allow a rod to be placed in the typical fashion.

In other embodiments, the system includes a screw extender remover toolshown in FIGS. 8a-d . FIGS. 8a-b illustrate one embodiment of a screwextender remover tool 800 and FIGS. 8c-d illustrate another embodimentof a screw extender remover tool 850.

Referring to FIGS. 8a-b , the remover tool 800 includes a shaft 833disposed between a distal end 864 and a handle 862. In some embodiments,the handle 862 is configured to have a rounded shape. As can beunderstood by one skilled in the art, the handle can be configured tohave any desired shape. The shaft 833 further includes a threadedportion 823 disposed substantially adjacent to the handle 862 and astopping mechanism 821 disposed between the handle and the threadedportion 823. The shaft 833 is configured to fit into the interiorpassageway 819 of the extender housing 810, as shown in FIG. 8a . Thethreaded portion 823 is configured to interact with an interior threadedportion 825 of the screw extender housing 810 upon insertion of removertool 800 into the screw extender housing 810, as shown in FIG. 8b . Uponinsertion of the remover tool 800, the threaded portions 823 and 825 areconfigured to interact with each other and a surgeon (or any othermedical professional) begins to rotate the remover tool in a downwarddirection (e.g., clockwise direction) in order to advance the removertool toward the screw. The remover tool is advanced until the stoppingmechanism 821 prevents its further advancement toward the screw. In someembodiments, the length of the remover tool's shaft can be appropriatelyselected so that upon full insertion of the remover tool, its distal end864 is configured to interact with flexible plates 817 containingprotrusions 815 and to push the plates 817 apart, thereby causingdisengagement of the screw extender housing 810 from the screw. Thestopping mechanism 821 is further configured to prevent over-insertionof the remover tool and thus, damage to the screw.

Thus, to remove or disengage the extender housing 810 from the screw, athreaded shaft 833 is inserted down the long axis of the extenderhousing. This threaded shaft 833 engages the threads 825 of the extenderhousing and forces the distal indented ends of the extender apart. Thismechanism releases the bone screw by releasing the tabs or flexibleplates 817 in the screw extender from its mating hole in the screw.

FIGS. 8c-d illustrate an alternate embodiment of the remover tool 850,according to some embodiments of the present invention. The remover tool850 includes a shaft 853, a stopping mechanism 857, and a handle 851. Insome embodiments, the handle 851 can be configured to be cannulated onthe inside to allow passage of additional devices through it, as shownin FIGS. 18a-c . Such additional devices can be configured to be used toassist in removal of the screw extender from the screw in the event thatthe remover tool 850 is unable to disengage from the screw.

As shown in FIGS. 8c-d , the remover tool 850 is configured to fitinside the extender housing 820 and to be advanced toward the distal endof the housing upon application of a downward force by the surgeon (orany other medical professional). The stopping mechanism 857 isconfigured to prevent over-insertion of the remover tool 850 and thus,damage to the screw. The remover tool 850 further includes at least oneprotrusion 861 extending from an outer surface of the shaft 853 of theremover tool 850 substantially adjacent the distal end of the shaft 853of the remover tool. The protrusions 861 are configured to interact withthe flexible portions 840 of the extender housing 810 when the removertool 850 is fully inserted into the screw extender housing (i.e., thestopping mechanism 857 is configured to interact with a proximal end ofthe screw extender housing) and rotated by the surgeon. Upon interactionof the protrusions and flexible locking features, the protrusions 861are configured to push on the flexible locking features 840, thuspushing them away for the interior passageway of the screw extender andthereby unlocking the screw extender housing from the screw. In someembodiments, a stopping mechanism 379 shown in FIG. 3d preventsover-rotation of the remover tool once it is inserted into the housingof the screw extender. The stopping mechanism 379 can be a protrusiondisposed on an inner surface of the extender housing substantiallyadjacent to the flexible indenters. The stopping mechanism 379 can befurther disposed in the path of the rotating protrusions 861, thus,preventing rotation of the remover tool beyond a particular point. Insome embodiments, the stopping mechanism 379 is configured to preventrotation of the remover tool by more than 90 degrees. The stoppingmechanism is configured to assist the surgeon in determining when theflexible members have been pushed apart and thus it is safe to removethe extender housing.

FIG. 6 illustrates a closer view of the interaction of the distal end ofthe remover tool 679 (which is similar to the remover tool 850) with theextender housing 610. As shown, the distal end of the remover tool 679includes protrusions 675 that are configured to extend away from thesurface of the remover tool 679. The flexible portions 640 (a, b)(similar to those shown in FIGS. 2a-3c ) include protrusions 642 (a, b),respectively, that are configured to be removed from the openings in thescrew upon rotation of the remover tool and subsequent interaction ofthe protrusions 675 of the remover tool with the flexible portions 640.

Thus, for the surgeon to remove the screw extender 610 from the screw(which is typically done after completion of a procedure), the screwextender remover device 679 is used. In addition to the components shownin FIGS. 8c-d , the remover device 679 includes a tip having protrusionsor ramps 675. The ramps 675 are configured to be disposed around theperimeter of the tip. The shaft and the tip of the remover device can becylindrical in order to match the cylindrical housing 610 of theextender device 600. As can be understood by one skilled in the art, theshaft and the tip have any other shape and can correspond to the shapeof the housing 610.

In some embodiments, the tip can be smaller than the shaft (e.g., thediameter of the tip is smaller the diameter of the shaft). The shaft isalso sized to fit inside the housing 610 of the extender device 600. Thestopping mechanism or a stopper rim 823 (see, FIGS. 8c-d ) that acts asa stopper and limits the depth at which the remover device 679 can beplaced into the housing 610, thereby controlling the depth that theramps 675 can engage the screw extender's indentor portions 640 (shownin FIG. 6).

The ramps 675 are configured to protrude away from the surface of thetip. The ramps 675 interact with the indentor portions 640 of thehousing 610, as illustrated in FIGS. 6-7 b, wherein FIGS. 7a-billustrate a bottom view of the remover tool interacting with theindentor portions. To remove the extender device 600 from the screw, theremover device 679 is inserted into the hollow housing 610 via itsproximal end (not shown in FIGS. 6-7 b). In some embodiments, the ramps675 of the remover device 679 can be aligned with the channels 619during insertion of the remover device 679 into the housing 610. Assuch, during insertion, the ramps 675 slide down the channels 619 (asshown in FIG. 6). The insertion of the device 679 continues until thestopper rim of the remover device (not shown in FIG. 6) comes in contactwith the proximal end of the extender housing. At this point, the device679 is rotated about 90 degrees (in any direction) by gripping thehandle of the remover device (shown in FIG. 8c-d ) and twisting it in anappropriate direction. By rotating the handle, the ramps 675 come incontact with the indentor portions 640. Due to flexible nature of theindentor portions 640, the ramps 675 are configured to push the indentorportions 640 towards exterior portion of the housing 610 of the extenderdevice 600. As the portions 640 are pushed apart, the indentorprotrusions 642 disengage from the openings of the screw. Once theprotrusions 642 are removed from the openings in the head of the screw,the extender device 600 becomes loose and can be removed from the screw.In some embodiments, the extender device 600 and the remover device 610can be removed at the same time. As can be understood by one skilled inthe art, other ways of removing the screw extender housing from thescrew are possible.

FIGS. 18a-c illustrate an exemplary supplemental screw extender removerdevice 1810, according to some embodiments of the present invention. Inthe event that a surgeon is unable to disengage the screw extenderdevice from the screw, the device 1810 can assist the surgeon in pushingthe screw extender away from the screw. As shown in FIGS. 18a-c , thesupplemental remover device 1810 includes a shaft 1803 disposed betweenthe distal tip 1807 and a handle 1801. The supplemental remover device1810 is configured to have a smaller diameter than that of the removertool 850. The shaft 1803 of the device 1810 is configured to be longerthan that of the remover tool 850. The remover tool 850 includes aninterior cannulated portion (not shown in FIGS. 18a-c ) that is disposedwithin the remover tool 850 and that further accommodates insertion ofthe device 1810, as shown in FIGS. 18a-b . The device 1810 furtherincludes a threaded portion 1805 configured to be disposed substantiallyadjacent the handle 1801. The threaded portion 1805 is configured tointeract with a threaded portion disposed inside the handle 851 of thedevice 850.

Thus, in the event that the surgeon cannot remove the screw extenderdevice 1802 from the screw 1807 using just the remover tool 850, thesurgeon inserts the device 1810 through an opening in the handle 851 ofthe remover device 850 and pushes the device 1810 along the interiorchannel (i.e., cannulated portion) of the remover device 850, untilthreaded portion 1805 comes in contact with an interior threaded portionof the remover device 850. At this time, the surgeon begins to rotatethe device 1810 along the threaded portion, thereby protruding the tip1807 of the device 1810 beyond the distal tip of the remover device 850.Thus, the tip 1807 comes in contact with the screw 1804 and effectivelypushes the screw extender 1802 along with remover tool 1810 away fromthe screw, thus, allowing the surgeon to remove the screw extender.

In some embodiments, the screw extender system of the present inventioncan be utilized for delivery of a percutaneous wire, which can then beutilized for advancement of a rod. Initially, to perform a spinalsurgery using the screw extender device of the present invention, thesurgeon initially makes an incision at a location where a first screwalong with a first screw extender device is to be implanted. Anotherincision can be made at another location where a second screw along witha second screw extender are to be implanted. As can be understood by oneskilled in the art, the surgeon can make as many incisions as arenecessary for creating a spinal stabilization system according to thepresent invention. Once, the incisions are made, the surgeon can couplethe screw extenders with the screws and advance this combination towardthe bony matter (e.g., vertebrae) for subsequent insertion. Once thescrew-extender-and-screw combination are inserted, the surgeon is ableto manipulate to the screw extenders and the screws for insertion ofpercutaneous wires and/or rods and/or other tools and device. In someembodiments, the screws can be poly-axial screws that allow the surgeonto manipulate the screw extenders in any direction while the screwextenders are rigidly attached to the screws.

FIGS. 9a-9h illustrate exemplary percutaneous wire insertion devices 900and 950, according to some embodiments of the present invention. Thedevices 900 and 950 are configured to be inserted into the screwextender's hollow interiors for guiding a percutaneous wire along andbetween the screw extenders. Referring to FIGS. 9a-c and 9h , a firstpercutaneous wire insertion device 900 is illustrated. The device 900includes a shaft 920 disposed between a proximal end 902 and a distalend 904. The device 900 is configured to be cannulated and thus includesan interior channel 941 configured to be disposed between an opening atthe proximal end 902 and an opening 930 disposed at the distal end 904of the device 900. In some embodiments, the opening 930 is configured tobe placed on the side of the device 900 so as to accommodate advancementof the wire toward another screw extender.

In some embodiments, the device 900 further includes two parts 927 a and927 b that are configured to be coupled using a nut or any other lockingmechanism 922 that is configured to be placed adjacent the proximal end902 of the device 900. The two-part configuration is provided for easeof removal of the device 900 from the screw extender. The two parts 927are configured to be coupled using hook features 932 and 933 disposed atthe distal end 902 of the device and the nut 922 disposed adjacent theproximal end 904 of the device 900. The nut 922 further includesthreading 924 that is configured to interact with the threading disposedat a proximal end of the screw extender on the screw extender's innersurface.

To secure the device 900 inside a screw extender device, the surgeoninserts the assembled device 900 with the distal end 904 into the screwextender's proximal end and slides the device 900 along the interiorpassageway of the screw extender until the threads 924 of the device 900begin to interact with the screw extender's interior threads disposed atthe proximal end of the screw extender. At this point, the surgeonbegins rotation of the nut 922, thereby screwing the nut 922 into thescrew extender without rotation of the shaft 920 of the device 900. Uponinsertion of the device 900 into the screw extender, the distal end 904of the device 900 is configured to fit within the passageway of the headof the screw. This allows proper alignment of the opening 932 towardanother screw extender. In some embodiments, upon placement of thescrews and respective screw extenders, the surgeon can manipulate thescrew extenders (coupled to the screws) so that the channels disposed onthe extenders' exterior surfaces are aligned toward each other. Thedevice 900 can be inserted with the opening 930 pointed toward thesecond screw extender that has been already installed into patient'svertebrae. During insertion of the wire through the device 900, the wireis advanced along the interior channel 941, out of the opening 930 andtoward the second extender through patient's muscle tissue.

As stated above, the device 900 is configured to be separated into toportions 927 a and 927 b. In some embodiments, the portion 927 a isconfigured to include the channel 941 for advancing the wire along thedevice 900. The channel 941 is configured to begin at the proximal endof the device 900 and protract through the entire length of the portion927 a toward the opening 930 disposed on the side of the device 900. Insome embodiments, the channel 941 is configured to be curved toaccommodate bending of the wire during advancement.

In some embodiments, the device 900 can include a balancing feature 925configured to extend away from the surface of the shaft 920. The feature925 is configured to prevent the device 900 from wobbling once it isinserted into the interior passageway of the screw extender.

The second device 950, shown in FIGS. 9d-g , is configured to include ashaft 951 disposed between a distal end 914 and a proximal end 912. Insome embodiments, the shaft can be configured to have a unitarystructure as opposed to a two-part structure of the device 900. Thedevice 950 further includes a nut or any other locking mechanism 947disposed substantially adjacent the proximal end of the device 950. Thenut 947 further includes threading 948 configured to interact with thethreading disposed at a proximal end of the screw extender on itsinterior wall. The nut is configured to be coupled to the shaft 951 atthe proximal end 912. The device 950 further includes a wire-pinching ora wire-holding mechanism 957 disposed at the distal end 914 of thedevice 950 and that is configured to pinch or secure the wire once thewire is advanced from the first screw extender (containing device 900)through patient's muscle tissue. The wire-pinching mechanism 957includes an opening 959. Upon advancement of the wire from the firstscrew extender and through the muscle tissue, the opening 959 isconfigured to receive the wire, which is then secured by thewire-pinching mechanism 957. The wire-pinching mechanism 957 iscontrolled by a knob or any other locking feature 945 disposed at theproximal end 912 of the device 950. The knob 945 is configured to becoupled to a shaft 955 that is inserted through the interior of theshaft 951 of the device 950. The shaft 955 is configured to have asmaller diameter than the diameter of the shaft 951. The shaft 955further includes a threading 913 that is configured to mate with athreading disposed on an interior surface of shaft 951 (not shown). Uponsuch mating, the surgeon can begin rotating the knob 945, therebyadvancing the shaft 955 through the opening 959, as illustrated in FIGS.9f-g . Upon advancement of the shaft 955, the shaft 955 is configured todecrease available space within opening 959, thereby pinning the wire toone of the walls of the opening 959.

FIG. 12 illustrates an exemplary wire 1010, according to someembodiments of the present invention. The wire 1010 includes a distaltip 1210 that is configured to lead the wire through the first extender(and the device 900), through the patient's muscle tissue, and into thesecond extender (and the device 950). The wire 1010 also includes aproximal end 1212 to which a rod 1984 is attached. The rod 1984 containsa hole where the wire interlocks with the rod. This attachment can havea thread or a mechanical attachment mechanism. The rod also contains afeature on the far proximal portion of the rod, (the end not attached tothe wire). This prevents the rod from being pulled through the screwextender. As can be understood by one skilled in the art, any other waysof coupling the wire to the rod are possible, e.g., any mechanicalcoupling of the wire and the rod are possible. In some embodiments, suchcoupling can be configured to allow for a quick release of the rod fromthe wire.

In some embodiments, the wire 1010 can be configured to be advancedusing a wire-advancement device or a wire advancement gun 1100, as shownin FIGS. 11a-b . FIG. 11a illustrates a cross-sectional view of the gun1100 and FIG. 11b illustrates a perspective view of the gun 1100. Insome embodiments, the gun 1100 includes a fixed handle 1102, anactuating handle 1104, and a barrel 1106 coupled to the handles 1102 and1104. The barrel 1106 is configured to include a loading opening 1114disposed at a proximal end of the barrel 1106 and a discharge opening1112 disposed at a distal end of the barrel 1106. The wire 1010 (notshown) is configured to be loaded into the loading opening 1114 anddischarged through the discharge opening 1112 by advancing the wirethrough the barrel 1106. The actuating handle 1104 is configured to bespring-resistance-loaded with respect to the fixed handle 1102, i.e.,upon squeezing the actuating handle 1104 toward the fixed handle 1102, aratcheting mechanism 1110 is configured to cause advancement of the wire1010 through the barrel 1106 and then forcing the handle 1104 to springback to its original position. In some embodiments, the surgeon, uponsqueezing the handle 1104 multiple times, can advance the wire 1010 toany desired length. As can be understood by one skilled in the art,other methods and/or instruments of advancing the wire 1010 are possibleand are not limited to the wire advancement device 1100 shown in FIGS.11a -b.

FIGS. 10a-e illustrate an exemplary procedure for advancement of wire1010 through screw extenders 1002 and 1004. As stated above, prior toadvancement of wire 1010, a surgeon (or any other medical professional)makes an incision above the location of implantation of a spinalstabilization system (represented by a screws, wires, rods, or any otherdevices), where the incision is configured to correspond to the locationwhere a first combination of a screw and a screw extender (i.e., screw1006, screw extender 1002) are to be implanted into patient's vertebrae.The surgeon can make another incision corresponding to the locationwhere a second combination of a screw and a screw extender (i.e., screw1008, screw extender 1004) are to be implanted into patient's vertebrae.Then, the surgeon implants first and second combination. The screwextenders are subsequently aligned so that the channels disposed ontheir housings (i.e., channels 1012 disposed on the first screw extender1002 and channels 1014 disposed on the second screw extender 1004;wherein channels can be partially open or fully open, as discussedabove) are facing each other. Along with the channels, the passagewaysin the heads of the screws (i.e., passageway 1016 in the head of thescrew 1006 and passageway 1018 in the head of the screw 1008) are alsoaligned, thus creating a virtual corridor between the passageways andthe channels.

Subsequent to the alignment procedure, devices 900 and 950 are insertedinto the interior portions of the housings of screw extenders 1002 and1004, respectively. The devices 900 and 950 are then secured usingappropriate knobs and threaded portions, as discussed in connection withFIGS. 9a-h . During insertion, the surgeon also aligns devices 900 and950 so that the opening 930 on the device 900 is aligned with theopening 959 of the device 950 (not shown in FIG. 10a ). The wireadvancement device 1100 is loaded with the wire 1010 and is then coupledto the device 900, as shown in FIG. 10a . Upon coupling of the device1100, the opening 1112 in the barrel of the device 1100 is aligned withthe opening on the device 900 disposed at a proximal end of the device900 so that the wire 1010 can safely pass through the interior channel941 of the device 900 (not shown in FIG. 10a ).

As the surgeon advances the wire 1010 using the device 1100, the wire1010 begins to travel along the channel 941 of the device 900 and isconfigured to advance out of the opening 930 of the device 900. Then,the wire 1010 begins to travel through the muscle tissue toward thesecond screw extender 1004. In some embodiments, the wire 1010 can beconfigured to have a sharpened tip in order to pierce through the muscletissue. As the wire 1010 is advanced further, it reaches and is passedthrough the opening 959 of the device 950 disposed within the secondscrew extender 1004. As the sufficient length of wire has passed throughthe opening 959, the surgeon actuates the pinching mechanism of thedevice 950, which compresses the wire 1010 in the device 950. Thesurgeon can observe wire advancement using X-ray.

Once the wire 1010 is secured in the device 950, the surgeon removes thewire-advancement device 1100, as illustrated in FIG. 10b . In someembodiments, the device 1100 can be simply slid off the wire 1010. Thus,at this stage, the wire remains secured by the device 950 and bothdevices 900 and 950 are secured within their respective screw extenders1002 and 1004. Then, the surgeon removes the nut 922 by unthreading italong the threads 924 (as shown in FIGS. 9a-b ) and removes the portion927 b followed by removal portion 927 a of the device 900 from the screwextender 1002, as shown in FIG. 10c . The device 950 still remains inthe second screw extender 1004. Referring to FIGS. 10d-e , the surgeonremoves the device 950 by unscrewing it from the housing of the extender1004. The device 950 is removed while the wire is being held by thepinching mechanism 957. Upon removal of the device 950, the wire 1010 isconfigured to protract through the first extender 1002, through themuscle tissue of the patient disposed between extenders 1002 and 1004,and the second extender 1004 while being coupled to the removed device950.

In some embodiments, the rod 1984 (shown in FIG. 104) can be configuredto be advanced along with the wire 1010 (or follow the wire through thescrew extender 1002 and then along the virtual corridor in the muscletissue created by the wire) for installation between two screws. FIGS.10f-g illustrate advancement of the rod 1984 along the wire 1010, whereFIG. 10f is a perspective view of the installed rod and FIG. 10g is across-sectional view. The rod 1984 can be configured to include anadvancing tip 1952 disposed at a distal end of the rod 1050 and aproximal end 1954 of the rod 1984 that in some embodiments can beconfigured to be coupled to a rod inserter (discussed below in detail).The rod's advancing tip 1952 is configured to travel from the firstscrew extender 1002 along the passageway created by the wire 1010 in themuscle tissue of the patient to reach the second screw extender 1004.Once the rod 1984 is disposed in the passageways of screws 1006 and 1008that are coupled to the respective screw extenders 1002 and 1004, therod 1984 can be secured using setscrews 1072 that can be advancedthrough the interior of the screw extenders using a setscrew settingdevice 1070, as shown in FIG. 10h . The setscrew setting device 1070 canbe configured to carry a setscrew at its distal tip and then uponinsertion into the passageway in the head of the implanted screw beginrotating the setscrew (having appropriate threads) along the threadsdisposed on the interior of the passageway of the implanted screw. Uponsetting the setscrew, the device 1070 can be released from the setscrew1072 and removed from the interior of the screw extender. Upon removalof the setscrew setting device 1070, the screw extenders can be removedusing the remover tools discussed above.

During installation of the spinal stabilization system of the presentinvention, the surgeon may wish to compress or distract the screwextenders that are coupled to the screws, which are implanted intopatient's bony matter. FIGS. 13a-13f and 14a-e illustrate variousembodiments of compressor/distractor tools. In some embodiments, thecompression motion can be characterized by pushing the distal ends ofthe screw extenders closer to each other and by pulling the proximalends of the screw extenders away from each other. The distraction motioncan be characterized by pushing the proximal ends of the screw extenderscloser to each other and by pulling the distal ends of the screwextenders away from each other (i.e., a reverse of the compressionmotion).

FIGS. 13a-f illustrate an exemplary compression/distractor tool 1300,according to some embodiments of the present invention. The tool 1300includes a housing 1310, compression/distraction arms 1304 (a, b),ratchet handle 1302, fulcrum 1312, and a release handle 1320. The arms1304 are configured to be coupled to the housing 1310 using respectiveshoulders 1315 (a, b). The arms 1304 are configured to substantiallyperpendicularly protrude away from the housing 1310 in the samedirection. The ratchet handle 1302 is configured to be disposed on theside of the housing 1310 that is opposite to the side where the arms1304 are disposed. The ratchet handle 1302 is configured to causemovement of the arms 1304 to and from each other. The ratchet handle1302 can be configured to use any conventional ratcheting mechanism foractivating such translational movement of the arms 1304. In someembodiments, the ratchet handle 1302 can be configured to have agripping portion to allow for better gripping of the handle 1302. Thearms 1304 further include respective inner cavities 1308 (a, b) that areconfigured to accommodate placement of the screw extenders between thearms 1304 and the fulcrum 1312. The fulcrum 1312 can be configured tohave a rhombus shape (as can be understood by one skilled in the art,other shapes are possible) that creates pivot points for the screwextenders being secured between the arms 1304 and the fulcrum 1312. Thepivot points are configured to allow tilting of the of the screwextenders either during compression or distraction motions. In someembodiments, the fulcrum 1312 can be configured to be rotated to allowfor variable angle distraction/compression of extenders. In someembodiments, the arms 1304 can be configured to include respectiveopenings 1306 (a, b) configured to accommodate insertion of pins 1353(a,b), which serve for attachment of an anti-torque device 1370 (shown inFIG. 130.

In order to prevent slippage of the screw extenders, an anti-splaydevice 1351 (shown in FIG. 15) can be placed over each of the proximalends of the extender housings prior to performing anydistraction/compression. In some embodiments, the anti-splay device canalso be anti-torque device. As can be understood by one skilled in theart, the terms “anti-splay” and “anti-torque” are used interchangeablyin this description and an anti-splaying device can be configured tohave anti-torque capabilities and vise versa. The anti-splay device 1351includes a body portion 1504 coupled to an anti-splay portion 1357. Thebody portion 1504 is configured to be coupled to the housing of thescrew extender using any known methods (e.g., hook-and-slide (shown inFIG. 15), snap-fit, or any other ways). The anti-splay portion 1357 isconfigured to interact with the arms of the 1304 or any other parts(e.g., fulcrum 1312) of the device 1300, as shown in FIGS. 13e-f . Uponcoupling, the anti-splay device 1351 and the screw extender housingcreate a unitary structure that can withstand the forces being appliedto it during compression/distraction motions. The anti-splay portions1357 can be configured to have mesh-like surface that is configured tocreate friction between components of the device 1300 and the anti-splaydevices 1351.

Referring to FIG. 13e , the screw extenders 1341 (a, b) are configuredto be arranged in the device 1300 for the purposes of compression, i.e.,pulling of the proximal ends of the screw extenders apart from eachother. For compressing the screw extenders, the anti-splay devices 1351(a, b) are coupled to proximal ends of the respective screw extenders1341(a, b). The device 1300 is configured to be arranged so that thefulcrum 1312 is disposed above the arms 1304 (a, b) in relation to theproximal ends of the screw extenders. The screw extenders 1341 areconfigured to be arranged between the respective arms 1304 and thefulcrum 1312, as shown in FIG. 13e . Once the screw extenders 1341 alongwith anti-splay device 1351 are secured between the respective arms 1304and the fulcrum 1312, the handle 1302 is further rotated to tilt thescrew extenders 1341 about side edges of the fulcrum 1312, therebycausing the distal ends of the extenders 1341 to be pushed together,whereas the proximal ends of the extenders 1341 are pulled apart. Insome embodiments, an anti-torque device 1370 can be coupled to the pins1353 to prevent slippage or any other movement of the extenders whileperforming compression. To increase the angle of inclination of theextenders 1341, the surgeon can continue rotating the handle 1302. Torelease the handle 1302 after compression, the handle 1320 is depressed.

FIG. 13f illustrates a reverse motion of distraction. To perform thismotion, the device 1300 is turned upside down in relation to the motionof compression situation, whereby the fulcrum 1312 is arranged below thearms 1304, as shown in FIG. 13f . During distraction, the arms 1304 areconfigured to interact with the anti-splay portions 1357 of theanti-splay devices 1351. By rotating the handle 1302, the device 1300 isconfigured to push the proximal ends of the extenders closer togetherwhile pulling the distal ends of the extenders apart. The anti-torquedevice 1370 can also be attached to the pins 1353 to prevent slippage ofthe device.

In some embodiments, the arms 1304 can be “powered” by a rack and pinionor a mechanical link system. In some embodiments, the anti-splay device1351 further prevents the extenders from splaying, bending, orundergoing flex during activities such as distraction, compression,torsion, and axial loads common in manipulating vertebra during spinesurgery.

FIGS. 14a-e illustrate another exemplary compressor/distractor device1480, according to some embodiments of the present invention. The device1480 includes a housing 1482 that includes an elongated opening betweentwo rails 1491 (a, b) running in parallel to each. The rails 1491 areconfigured to be connected at one end using an elevated rounded section1483 and at the other end using a connection rod 1493. The device 1480further includes a crank-and-ratchet mechanism 1474 that is configuredto slide along the rails 1491 using a sliding mechanism 1490 disposedwithin each rail. The rail 1491 a further includes a plurality ofratchet teeth 1484 with which a ratchet wheel 1495 of the mechanism 1474is configured to interact, as shown in FIG. 14c . The mechanism 1474further includes a handle 1481 that is coupled to the ratchet wheel 1495and configured to cause rotation of the ratchet wheel 1495. Themechanism 1474 further includes a release handle 1482 that is configuredto allow movement of the mechanism toward the elevated portion 1483 andprevent a reverse motion of the mechanism 1474. Upon depressing of therelease handle 1482, the mechanism 1474 is released and is allowedmovement (i.e., translation) away from the elevated portion 1483.

The elevated portion 1483 of the device 1480 includes a spring-loadedlocking feature 1488 having two spring-loaded locking pins 1489 (a, b)connected by a rod 1499. The rod 1499 and the elevated portion 1483 areconfigured to create an opening 1485 for insertion of a screw extenderdevice, as shown in FIGS. 14d-e . In some embodiments, the screwextender device housing's features 391 shown in FIGS. 3a-b areconfigured to interact with the rod 1499 and prevent movement of thescrew extender device inside the opening 1485. A second screw extenderdevice can be inserted into an opening created between the rails 1491,the rod 1499 and the mechanism 1474. The second screw extender can besecured by translating mechanism 1474 along the rails 1491, until thesecond screw extender is secured between the rod 1499 and the mechanism1474. In some embodiments, each of the openings 1485 and 1487 areconfigured to be sized to allow insertion and securing of the screwextenders. The spring-loaded features 1489 are configured to be lockedin using a screwdriver or any other tool. Referring to FIG. 14d , amotion of distraction is shown, whereby the distal ends of the screwextenders are pulled apart. During this motion, the device 1480 isconfigured to be secured so that the ratchet teeth 1484 are facingupwards. FIG. 14e illustrates a motion of compression, whereby theproximal ends of the screw extenders are pulled apart. In this case, theratchet teeth 1484 are configured to face downwards. The device shown inFIGS. 14a-e is advantageous as no anti-splay or anti-torque devices arerequired to maintain stability of the screw extenders duringdistraction/compression motions.

FIGS. 16a-c illustrate an exemplary caliper tool 1600 having screwextender attachment barrels 1602 (a, b) that are coupled to a measuringruler 1604, whereby the measuring ruler 1604 is configured to beslidably coupled to the barrel 1602 a (for example) and fixed to thebarrel 1602 b. In some embodiments, the barrels 1602 are also coupled torespective handles 1603(a, b) that are configured to allow a surgeon toeasily translate the barrels 1602. The barrels 1602 are configured to behollow inside and are appropriately sized to accommodate placement ofthe screw extenders. The caliper tool 1600 assists the surgeon indetermining the length of a rod that is needed to for a particularsurgery.

Upon installation of the screw extenders into the vertebrae, the surgeonplaces the barrels 1602 over the proximal ends of the screw extenders(as shown in FIG. 16c ) and slides one of the barrels 1602 a along theruler 1604. The ruler 1604 is configured to have markings 1608indicating an appropriate size of the rod needed for surgery. In someembodiments, the ruler 1604 can be configured to have a stoppingmechanism 1607 that prevents slippage of the barrels 1602 from the ruler1604. Once the size of the implant is noted on the rule 1604, thecaliper tool 1600 can be removed from the extenders. In someembodiments, the moving barrel 1602 b can also include a locking feature1611 that the surgeon can use to lock the device upon determining theappropriate size of the rod.

FIGS. 17a-c illustrate an exemplary screw extender guide tool 1700 forreinstalling the screw extender, according to some embodiments of thepresent invention. The tool 1700 can be used in the event that a screwextender is removed from (or for example, accidentally slips off) theinstalled screw and needs to be re-installed to the screw. The tool 1700can be used during any re-installation procedures.

The tool 1700 includes a hollow housing 1702 disposed between a distalend 1704 and a proximal end 1706. The proximal end 1706 is configured toinclude a handle 1708 that controls rotation of a threaded portion 1710disposed at a distal end 1704. The threaded portion 1710 is configuredto interact with the threaded portion inside the head of the screw (notshown in FIG. 17a ). Thus, in the event that the screw extender 1750 isremoved from the screw 1752 (either accidentally or not) and needs to bereinstalled, the tool 1700 is placed over the wire 1754 and sliddownwards along the wire 1754 and toward the screw 1752. Upon reachingthe screw 1752, the tool 1700 is screwed into the head of the screw 1752and thus, secured to the screw 1752. Once the tool 1700 is secured tothe screw, the extender 1750 can be advanced along the tool 1700 forcoupling to the screw in a similar fashion as described above. Aftercoupling of the extender 1750, the tool 1700 is unscrewed from the headof the screw 1752 and removed along the wire 1754. In some embodiments,the wire 1754 can be a guide-wire placed to outline a perimeter of thesurgical procedure and guide the surgeon during procedure.

FIGS. 19a-e illustrate various embodiments of a rod inserter device,according to some embodiments of the present invention. FIGS. 19a-billustrate an exemplary a rod inserter tool 1910. The rod inserter tool1910 includes a handle 1912 disposed at a proximal end of the tool 1910and a shaft 1914 coupled to the handle 1912. At a distal end of theshaft 1914, the shaft includes a rack-and-pinion mechanism 1920 that isconfigured to slide out of the shaft 1914 and to rotate a rod 1930 (thatwas previously coupled to the mechanism 1920) by approximately 90degrees. As can be understood by one skilled in the art, other angles ofrotation are possible. In some embodiments, such rotation isaccomplished through rotation of the handle 1912 that is coupled to rods1925 disposed within the shaft 1914. Rotation of the handle 1912 causesthe rods 1925 to push down the rods 1927 of the rack-and-pinionmechanism 1920, thereby causing the rotational motion of the rod 1930.Reverse rotation of the handle 1912 causes reverse rotation of the rod1930.

In some embodiments, the rod 1930 (which is similar to the rod 1984shown in FIG. 190 includes an opening 1979 disposed at its distal endand configured to be coupled to an insertion pin of the rack-and-pinionmechanism 1920. This allows the rod 1930 to be held in place by the rodinserter tool 1910, while the rod is being inserted into the screwextenders. The rod further includes ratchet teeth 1978 (shown in FIG.190 that are configured to be disposed at the distal end of the rod andfurther configured to interact with ratchet teeth 1922 of the mechanism1920. The ratcheting interaction of the rod 1930 and the mechanism 1920provides a controlled rotation of the rod 1930.

FIGS. 19c-e illustrate another exemplary rod insertion tool 1950,according to some embodiments of the present invention. The tool 1950includes a shaft 1955 disposed between a distal end 1957 configured tobe coupled to a rod 1930 (in a similar fashion as with the tool 1910 inFIGS. 19a-b ) and a control handle 1959. The control handle 1959 isconfigured to be threadedly secured inside the shaft 1955 using threads1961. The control handle 1959 is further secured to an interior rod 1971that is disposed inside the shaft 1955 and is configured to slide insidethe shaft 1955. The rod 1930 is rotatably coupled to the interior rod1971. Upon rotation of the control handle 1959, the interior rod 1971begins to push on the pivoted connection between rod 1930 and interiorrod 1971, thereby causing the rod 1930 to rotate, as shown in FIGS.19d-e . In some embodiments, the interior rod 1971 can be configured tobe spring loaded inside the shaft 1955 using springs 1963, which causethe handle 1959 to spring back upon completion of rotation of the rod1930. In some embodiments, the rod 1930 can be configured to include apivot hole 1977 that is configured to disengage from the interior rod1971 upon rotation of the rod 1930. Thus, this allows for a release ofthe rod 1930 from the interior rod 1971.

In some embodiments, the shaft 1955 further includes a measuring scale1967 disposed along a portion of the length of the shaft 1955. The scale1967 is configured to determine the proper depth of insertion of theinserter tool 1950 into the screw extender housing.

FIGS. 20a-l illustrate a procedure for rod insertion using a tool 1910shown in FIGS. 19a-b . Referring to FIGS. 20a-d , the rod inserter tool1910 coupled to the rod 1930 (pointing towards the screw extender) isinserter into the first screw extender 2002. Upon insertion, the rod1930 is rotated to being protruding outside the exterior channels of thefirst screw extender 2002 and to begin pointing toward the second screwextender 2004, as shown in FIGS. 20e-f . Then, the rod 1930 is advancedinto one of the exterior channels of the second screw extender 2004, asshown in FIGS. 20g-j . Upon being inserted into the channels of thefirst and second screw extenders 2002 and 2004, the inserter tool 1910is disengaged, as shown in FIGS. 20k-l . FIGS. 20m-o illustrateinsertion of the rod 1930 using the tool 1950 shown in FIGS. 19c -e.

FIGS. 21a-e illustrate an exemplary rod reducer tool 2100 for reducingthe rod 1930 toward the implanted screw, according to some embodimentsof the present invention. The rod reducer 2100 includes a rod reducershaft 2102 coupled to a handle 2104. The handle 2104 is configured to berotatably coupled to the shaft 2102. The shaft 2102 is configured toinclude an interior passage 2120 for insertion over a screw extender.The reducer further includes handle threads 2132 and extender threads2135. The extender threads 2135 are configured to interact with thethreads disposed on an interior surface of the screw extender housing2165 (as shown in FIG. 21a ) and thus are configured to secure the tool2100 to the screw extender housing. The handle threads 2132 areconfigured to allow rotation of the handle 2104 once the reducer tool2100 is secured to the extender housing 2165. In some embodiments, thereducer tool 2100 includes a window 2140 disposed on the shaft 2102 thatallows a surgeon to get a visual confirmation that the extender housing2165 has been secured to the reducer tool 2100.

In some embodiments, the handle 2104 of the tool 2100 includes anopening 2108 that is configured to allow insertion of setscrews or othertools, once the reducer tool 2100 has aligned the rod 1930 and it istime to secure to the implanted screw.

FIGS. 22a-b illustrate an exemplary rod inserter tool 2200, according tosome embodiments of the present invention. The tool 2200 is configuredto allow pushing of the rod 1930 disposed in the channels between twoextenders 2202 and 2204 toward the implanted screws. The tool 220 canpush the rod 1930 from a side of one of the extenders (as shown in FIG.22b ) or between two extenders (as shown in FIG. 22a ). The scenariosshown in FIGS. 22a-b may require different types of incisions made. Forexample, the scenario shown in FIG. 22a may require a surgeon making anincision that connects the two incisions created for the two extenders.In some embodiments, the tool 2200 includes an elongated shaft 2207coupled to scissor-like handles 2209 at a proximal end and gripping jaws2211 at a distal end. The gripping jaws 2211 are configured to grip therod 1930 upon actuation of the handles 2209. Once the jaws 2211 havegripped the rod 1930, the surgeon can begin pushing the rod toward theimplanted screws.

In some embodiments, components of the present invention can bemanufactured from Nitinol or any other suitable materials.

In some embodiments, the above referenced extender devices can be usedby a surgeon (or any other medical professional) in a variety ofapplications. The extender devices can be used subsequent to preparationof a bone for screw-implantation. Screw is implanted using a bone biopsyneedle, such as a Jamshidi needle, manufactured by Cardinal Health Inc.,Dublin, Ohio, USA, which can be followed by progressive dilation. Oncethe bone has been prepared, the bone screw is implanted. Afterimplantation, the bone screw can be manipulated for orientation usingthe extender device. This “extender” extends out of the stab wound andallows the surgeon to control the implanted screw.

The following description illustrates some additional tools that can beused with the screw extender devices that have been discussed above andshown in FIGS. 1-22 b.

FIGS. 23a-i illustrate an exemplary compressor-distractor tool 2300,according to some embodiments of the present invention. FIGS. 23a-billustrate perspective views of the tool 2300; FIG. 23c illustrates thetool 2300 being coupled to screw extenders that are attached torespective screws implanted into a vertebrae; FIGS. 23d-e illustrate thetool 2300 being in a compressed state (FIG. 23d is a perspective viewand FIG. 23e is a cross-sectional view); FIGS. 23f-g illustrate the tool2300 being a distracted state (FIG. 23f is a perspective view and FIG.23g is a cross-sectional view); FIGS. 23h-i are perspective views of thetool 2300 being attached to screw extenders along with respective screwassemblies.

Referring to FIGS. 23a-i , the tool 2300 is configured to applycompressive and/or distractive forces to screw extenders and,ultimately, screw assemblies that have been implanted into vertebra andcoupled to the screw extenders. In some embodiments, the tool 2300 isplaced over top portions of two screw extenders that can be adjacent toone another and then, by turning a handle or a knob, the screw extenderassemblies can be compressed together or distracted from each other, asshown in FIG. 23c -g.

In some embodiments, the tool 2300 includes a first screw extenderholding portion 2302 and a second screw extender holding portion 2304,as shown in FIGS. 23a-b . Each portion 2302, 2304 can be configured tohave a respective base part 2303 coupled to a respective top part 2305.The base part 2303 is configured to be coupled to a screw extender (notshown in FIGS. 23a-b ). The top part 2305 is configured to protrude awayfrom the base part 2303 and, in some embodiments, can be furtherconfigured to have a curvature. The top parts of the portions 2302 and2304 can be configured to curve toward each other, where portions 2302and 2304 are pivotally coupled to each other at their respective tops,as shown in FIGS. 23a -b.

The portions 2302 and 2304 are pivotally coupled to each other using apivoted connection 2306. In some embodiments, a removable handle 2308coupled to a rod 2307 can be inserted through openings at the top of theportions 2302 and 2304 to allow pivoting of the portions 2302, 2304about the rod 2307.

The base parts 2303 of each portion 2302 and 2304 include respectivescrew extender openings 2312 and 2314 disposed at the bottom of therespective base parts. The openings 2312 and 2314 are configured toreceive upper portions of screw extenders, i.e., tool 2300 is placed ontop of the extenders using the openings 2312 and 2314, as shown in FIGS.23c -i.

The tool 2300 further includes a multi-threaded screw 2310 that isconfigured to further connect the portions 2302 and 2304 at their baseparts 2303. The screw 2310 is configured to be inserted through openings2309, where the openings 2309 are configured to be disposedsubstantially perpendicularly to the openings 2312 and 2314. The screw2310 is configured to include multi-directional threading 2315 and 2317that is disposed at opposite ends of the screw. The base parts 2303 ofeach portion 2302, 2304 include respective threading mechanisms 2319,2321. The mechanism 2319 is configured to interact with threading 2315of the screw 2310 and mechanism 2321 is configured to interact withthreading 2317 of the screw 2310. The screw 2310 can be furtherconfigured to include a handle 2320 for rotating the screw once it isinserted through the openings 2309. Since threading 2315 and 2317 haveoppositely disposed threads, rotation of the handle 2320 and the screw2310 in one direction (e.g., clockwise direction 2341) causes base parts2303 of portions 2302 and 2304 to come closer to each other (i.e.,compression). Similarly, rotation of the handle 2320 and the screw 2310in an opposite direction (e.g., counterclockwise direction 2342) causesbase parts 2303 of portions 2302 and 2304 to spread apart from eachother (i.e., distraction). Such movement of the base parts 2303translates into compression/distraction movement of the screw extendertowers inserted into the respective openings 2312 and 2314. Compressedextenders are illustrated in FIGS. 23d-e . Distracted extenders areillustrated in FIGS. 23f-i . Because the screw 2310 rotates at the sameangular velocity, equal rotational force is applied to the portions 2302and 2304 that allows the portions to translate along the length of thescrew 2310 equally in their respective directions (which depends oncompression or distraction).

In some embodiments, the fulcrum handle 2308 can be configured to beremovable and can be further configured to accommodate right-handed orleft-handed usage. This is advantageous in the event that the portions2302 and 2304 may need to be separated.

As shown in FIG. 23a , the respective top parts 2305 of the portions2302 and 2304 can be configured to include openings 2331 that allowaccess to the screw extender towers that are inserted into therespective openings 2312 and 2314. The surgeon (or other medicalprofessional) can insert instruments or any other tools through the topparts 2305 and respective openings 2331 of the tool 2300 and into thescrew extender towers. The openings 2331 can be also configured toprovide a visual indicator of the placement of the screws through thescrew extender towers/housings.

As can be understood by one skilled in the art, the tool 2300 can beconfigured to compress/distract at least two screw extender towers.

FIGS. 24a-l illustrate an exemplary end-holding rod inserter tool 2400,according to some embodiments of the present invention. The tool 2400 isused during rod insertion procedures and is configured to grip the rodat a distal end by squeezing onto the rod.

Referring to FIGS. 24a-l , the tool 2400 includes a handle 2402 coupledto a curved shaft 2404. The shaft 2404 includes a distal end 2406configured to secure a rod and a proximal end 2408 that is coupled tothe handle 2404. In some embodiments, the rod can be held at anapproximately 75 degrees (or any other angle) with respect to the shaft2404. The proximal end 2408 is configured to have a curved portion 2409,which allows the user of the tool 2400 to conveniently secure andmanipulate the rod inside the screw extenders coupled to respectiveimplanted screw assemblies.

The shaft 2404 is configured to have a stationary or static portion 2412and a sliding portion 2414. The sliding portion 2414 is configured toslide on top of the stationary portion 2412. The stationary portion 2412is configured to be permanently secured to the handle (or inside thehandle) 2402. Both portions 2412 and 2414 have curved proximal ends 2409(a, b). The distal end of the stationary portion 2412 further includesan L-shaped receiving groove 2415 that, in combination with the distalend of the sliding portion 2414, is configured to secure the rod. Insome embodiments, as illustrated in FIG. 24l , the distal end of thestationary portion 2412 can have a male mating feature 2451 that isconfigured to interact with a female mating feature 2453 a disposed onthe rod 2460. The rod 2460 can be configured to have another matingfeature 2453 b disposed oppositely to the mating feature 2453 a andconfigured to interact with the distal end of the sliding portion 2414(not shown in FIG. 24l ). The rod 2460 is configured to be securely“squeezed” between the mating feature of the stationary portion 2412 andthe sliding portion 2414, when the rod is placed into the L-shapedreceiving groove 2415.

The sliding portion 2414 is configured to be coupled to a rotarymechanism 2420 disposed inside the handle 2402. The rotary mechanism2420 is further coupled to a control knob 2425. The rotary mechanism2420 further includes a first rod 2427 that is disposed between andcoupled to the knob 2425 and a threaded nut 2429 and a second rod 2431that is coupled to the threaded nut 2429 and an interior portion of thecurved proximal end of the sliding portion 2412. The threaded nut 2429is configured to rotate inside and along a threaded portion 2433, asshown in FIGS. 24g, 24i, and 24k . The threaded portion 2433 is coupledto the sliding portion 2414 and depending on the movement of thethreaded nut 2429 either pulls or pushes the sliding portion 2414 alongthe stationary portion 2412, as shown in FIGS. 24g and 24k . Rotationand translation of the threaded nut 2429 along the threaded portion 2433is controlled by the control knob 2425, whose rotational motion causesthe first rod 2427 to rotate, thereby rotating the threaded nut 2429 andthus, either pulling towards or pushing away from the control knob 2425.

In some embodiments, the stationary portion 2412 can be configured tohave grooved stopper portions 2471 (a, b) disposed in its shaft, and thesliding portion 2414 can be configured to have corresponding protrusions2473 (a, b) that slide inside the stopper portions 2471 when slidingportion 2414 is translated along the stationary portion 2412. Thestoppers prevent the sliding portion 2414 from overextending and thus,damaging the rod 2460 or the tool 2400.

Thus, to secure the rod 2460 to the tool 2400, the control knob 2425 isrotated in one direction (e.g., counterclockwise) to open the L-shapedreceiving groove 2415 at the distal end of the shaft of the tool 2400.Thus, such rotation translates the sliding portion 2414 along thestationary portion 2412 toward the handle 2408, thereby spreading apartthe distal ends of the portions 2412, 2414 and forming a gap between theproximal curved ends of the stationary and sliding portions, as shown inFIG. 24k . The rod is then placed into the opened L-shaped receivinggroove 2415. Optionally, mating features 2451 and 2453 a on thestationary portion 2412 and the rod 2460, respectively, can be engagedto further secure the rod. Once the rod 2460 is in place, the knob 2425is rotated in an opposite direction (e.g., clockwise) and the slidingportion 2414 is translated away from the handle 2408 and toward thedistal end of the stationary portion 2412 that is holding the rod 2460.The sliding portion 2414 contacts the rod 2460 and secures it inside theL-shaped receiving groove 2415. Optionally, mating features of thesliding portion and the rod can be engaged to provide further stabilityto the secured rod. In some embodiments, the tool 2400 can be configuredto include a locking mechanism to prevent unintentional translation ofthe sliding portion 2414. The rod 2460 can be released by performing theabove steps in reverse. The mating features are also configured toprevent axial and torsion forces during rod-insertion procedures.

FIGS. 25a-e illustrate an exemplary percutaneous end-holding rodinserter tool 2500, according to some embodiments of the presentinvention. The tool 2500 is in some respects similar to the tool 2400 asit allows rod holding during insertion of the rod through the screwextender system. The tool 2500 includes a handle 2502 and a curved shaft2504. The shaft 2504 has a proximal end 2509 to which a control knob2508 is attached and a distal end 2511 that is configured to secure arod 2560. The proximal end 2509 is further configured to be permanentlycoupled to the handle 2502. The handle 2502 is configured to assist theuser of the tool 2500 during rod-insertion procedures. The distal end2511 includes a rod-holding mechanism 2570. The mechanism 2570 isconfigured to clamp the rod 2560 in a pliers-type fashion. The mechanism2570 may include an upper immovable lip 2571 that is permanently coupledto the distal end of the shaft 2504 and a pivoting lip 2573 that isrotatably coupled to the distal end of the shaft 2504.

As illustrated in FIG. 25e , in some embodiments, the immovable lip 2571can be configured to include a male mating feature 2575 that isconfigured to interact with a corresponding female mating feature 2576disposed on the rod 2560. In some embodiments, the pivoting lip 2573 canbe also configured to include similar mating features that can interactwith corresponding mating features disposed on the rod 2560 (not shownin FIG. 25e ). Similarly to the tool 2400, the mating features allowbetter gripping of the rod 2560, when the rod 2560 is placed between theimmovable lip 2571 and the pivoting lip 2573. The mating features arealso configured to prevent axial and torsion forces during rod-insertionprocedures.

The curved shaft 2504 further includes a slidable rod 2520 disposed inan interior portion of the shaft 2504. The slidable rod 2520 is coupledto a threaded mechanism 2525 disposed at the proximal end of the shaft2504. The slidable rod 2520 is further rotatably coupled to the pivotinglip 2573.

To secure the rod 2560 to the tool 2500, the knob 2508 is rotated in onedirection (e.g., counterclockwise), causing the rod 2520 to be pushedaway from the handle 2502, and thereby rotating the pivoting lip 2573 ina downward direction away from the immovable lip 2571. The rod 2560 isinserted into an opening created by the two lips 2571, 2573. In someembodiments, the mating features on the rod 2560 and the lip 2571 caninteract with each other. Once the rod 2560 is inserted, the knob 2508is rotated in an opposite direction (e.g., clockwise), thus causing theslidable rod 2520 to retract toward the handle, and thereby rotating thepivoting lip 2573 in an upward direction toward the immovable lip 2571and the rod 2560. In some embodiments, the mating features of the rod2560 and the pivoting lip 2573 can be configured to interact to furthersecure the rod 2560 inside the mechanism 2570. In some embodiments, thetool 2500 can be configured to have a stopper mechanism that can beconfigured to prevent accidental unwinding of the knob 2508, which canrelease the rod 2560. As can be understood by one skilled in the art,the tool 2500 can have both lips 2571, 2573 rotate to secure the rod.

FIGS. 26a-k illustrate an exemplary in-situ re-attachment guide tool2600, according to some embodiments of the present invention. In someembodiments, the tool 2600 is configured to facilitate re-attaching ascrew extender 2601 to a screw assembly while the latter one is alreadyimplanted into vertebrae. This tool can also be useful in the followingscenarios: (1) when screw assembly is by itself; (2) when the screwassembly already includes a rod that has been inserted; and (3) when thescrew assembly already includes a rod that has been inserted and securedby a setscrew.

FIG. 26a illustrates the tool 2600 being coupled to a screw extender2601 having a housing 2602 with a fully open channel 2603. Screwextenders 2601 have been previously discussed above with regard to FIGS.1-22 b. As shown in FIG. 26b , the tool 2600 can be configured toinclude two removable shafts 2604 and 2606 along with a main assembly2608. The shaft 2604 is configured to be used when a setscrew has notbeen attached to a screw assembly being implanted into vertebrae (i.e.,scenarios nos. (1) and (2)). The shaft 2604 has a distal end 2605 a anda proximal end 2605 b. The distal end 2605 a includes a threaded tip2610 that allows screwing the shaft 2604 into the head of the screwassembly when the setscrew is not installed. The proximal end 2605 baccommodates placement of a removable knob 2611 that is configured torotate the shaft 2604 during installation into and removal from thescrew assembly.

Alternatively, if the setscrew has been already installed into the screwassembly (i.e., scenario no. (3)), the shaft 2606 can be used. The shaft2606 includes a distal end 2607 a and a proximal end 2607 b. The distalend 2607 a includes a peg 2612 that is configured to be inserted intothe setscrew and that secures the shaft 2606 to the setscrew. Theproximal ends 2607 b and 2605 b are similar to one another. The knob2611 can be configured to be secured to the proximal end 2607 b of theshaft 2606 in the same way as with respect to the shaft 2604.

Once one of the shafts 2604, 2606 is installed into the screw assembly,as shown in FIGS. 26c-d , the main assembly 2608 is the placed over theinstalled shaft. The main assembly 2608 includes a proximal end 2615 anda distal end 2617 and a shaft 2619 disposed between the proximal end2615 and the distal end 2617. The proximal end 2615 includes a handle2618. The distal end 2617 includes a hollow housing 2621 that isconfigured to be placed over a head of an installed screw and furtheraccommodate placement of a screw extender housing. The shaft 2619 andthe handle 2618 include an interior channel 2625, which is used to placethe assembly 2608 over the shaft 2604 or 2606. In some embodiments, thelength of the shaft 2619 or, alternatively, the distance between thedistal end of the handle 2618 and the proximal end hollow housing 2621is greater than the length of the screw extender 2601 that is to bere-attached to the screw.

The hollow housing 2621 has a diameter that is larger than the diameterof a screw extender 2601 that is to be re-attached to the screwassembly. In some embodiments, the housing 2621 can be furtherconfigured to have grooved portions 2622 disposed at its distal end,where the grooved portions 2622 are configured to be placed over the rodthat has been previously secured to the screw assembly (if such rod hasbeen installed).

Once the shaft 2604 or 2606 and the assembly 2608 are installed to thescrew assembly, the knob 2611 secures the combination of the shaft 2604(or 2606) and the assembly 2608 to the screw, as shown in FIG. 26h .Then, the screw extender 2601 having an open channel (as illustrated inFIGS. 3a-c ) is configured to be slid over the flat shaft 2619 via itsopen channel. The thickness of the flat shaft 2619 can be configured tobe less than the width of the screw extender's 2601 open channel. Oncethe screw extender 2601 is placed over the shaft 2619 (as shown in FIG.26i ), the screw extender 2601 is translated toward the screw assembly(e.g., in a downward fashion) along the shaft 2619, thereby insertingthe screw extender 2601 into the hollow housing 2621, as shown in FIG.26j . Upon insertion, the screw extender 2601 is secured to the screwassembly, as discussed above with regard to FIGS. 1-22 b. Once the screwextender 2601 is secured to the screw assembly, the tool 2600 isremoved. The tool 2600 can be unscrewed from the screw assembly, if thesetscrew is not installed; alternatively, it can be removed from thescrew assembly by removal of the assembly 2608 and the shaft 2606, ifthe setscrew is installed. Once, the tool 2600 is removed from the screwassembly, the screw extender 2601 is configured to remain attached tothe screw assembly, as shown in FIG. 26 k.

FIGS. 27a-g illustrate an exemplary rod reducer tool 2700, according tosome embodiments of the present invention. In some respects, the rodreducer 2700 is similar to the rod reducer 2100 shown in FIGS. 21a-ewith the following differences. In some embodiments, the rod reducer2700 includes a threaded reduction mechanism and allows its outer shaftportion to be independent of the spinning or rotating forces. The handleof the rod reducer 2700 is configured to be attached to an internalthread that engages a screw extender tower. The rod reducer 2700includes a collar that is attached to the main shaft and is configuredto float within the handle assembly. As such, the rotational threadingof the rod reducer 2700 causes the rod to be forced downward along thescrew extender, however, the collar and/or the main shaft of the rodreducer are configured to remain in place. The rod reducer 2700 isconfigured to provide counter-rotational forces on the rod and tofurther provide a better translation of downward forces from the rodreducer to the rod.

Referring to FIG. 27a-f , assuming that a screw extender tower/housing2710 is already coupled to the screw assembly 2730 that has beenimplanted into the vertebrae and a rod 2720 has been placed inside thescrew extender 2710 substantially adjacent to the screw assembly, therod reducer tool 2700 can be placed over the screw extendertower/housing 2710 for further securing the rod 2730 in place. In someembodiments, the rod reducer 2700 includes a main shaft 2702 coupled toa handle 2704. As shown in FIG. 27c , a cross-sectional view of the rodreducer 2700, the rod reducer includes a hollow interior 2708 that isconfigured to accommodate placement of the screw extender housing/tower2710 (See, FIGS. 27d-e ). The handle 2704 is configured to include aninterior threading mechanism 2712 that is further configured to engagethe screw extender housing 2710, as shown in FIGS. 27d-e . Upon engagingthe screw extender tower, the threading mechanism 2712 is rotated in adownward fashion using the handle 2704, thereby translating the rodreducer 2700 also in a downward direction toward the screw assembly andthe rod. The handle is configured to rotate together with the main shaft2702. In some embodiments, the handle is configured to rotateindependently of the main shaft 2702, where the main shaft 2702 does notrotate. Such translation of the rod reducer 2700 pushes the rod towardthe screw assembly, as shown in FIGS. 27e-g . After pushing the rod tothe screw assembly, the rod reducer tool 2700 is removed.

FIGS. 27h-i illustrate an alternate embodiment of a rod reducer tool2750, according to some embodiments of the present invention. The rodreducer tool 2750 is configured to be similar to the rod reducer tool2700. The tool 2750 includes a handle 2755, a main shaft 2757, and acollar 2759 disposed between the handle 2755 and the main shaft 2757.The handle 2757 includes a handle shaft 2761, a first handle threading2763 and a second handle threading 2765, wherein the first handlethreading 2763 is disposed at the proximate end of the handle shaft 2761and the second handle threading 2765 is disposed at a distal end of thehandle shaft 2761. The first handle threading 2763 is configured toallow spinning of the handle 2755 about the handle shaft 2761 during thetranslational movement of the tool 2750 along the screw extender tower(not shown in FIGS. 27h-i ). The second handle threading 2765 isconfigured to engage the screw extender tower in similar fashion asdiscussed above and shown in FIGS. 27a-g . The collar 2759 is configuredto include a collar threading 2767 that interacts with a shaft threading2769 during rod reduction procedure (i.e., translation of the shaft in adownward fashion along the screw extender tower/housing). The collar2759 allows a user to hold the collar 2759 during the rod reductionprocedure and rotate the handle 2755 to force the tool 2750 toward thescrew assembly and to thereby push the rod toward the screw assembly. Itshould be noted that during rod reduction procedures, the main shaft2757 is static, while handle 2755 and the collar 2759 are configured torotate independently of one another and the shaft 2757. In someembodiments, the distal tip of the shaft 2757 includes two groovedportions 2771 (a, b) that are configured to accommodate placement of therod during rod reduction procedures. The grooved portion 2771 allowbetter stability of the rod reducer tool 2750 during the procedure.

FIGS. 28a-e illustrate another exemplary tool, a screw extender removertool 2800, according to some embodiments of the present invention. Thetool 2800 is configured to be used when it is necessary to remove ascrew extender tower/housing that has been attached to a screw assembly.This tool is configured to easily release the screw extender from thescrew assembly while localizing and minimizing axial forces on the screwassembly.

Referring to FIG. 28e , in some embodiments, the tool 2800 includes ahandle 2802 coupled to a shaft 2804. The handle 2802 includes a staticportion 2805 and a moving portion 2807. The moving portion isresistance-loaded using a spring-like mechanism 2809. The mechanism 2809allows moving portion 2807 to be pushed toward the static portion 2805against resistance of the mechanism 2809 and to return portion 2807 toits original state upon its release. The moving portion 2807 is coupledto a lever 2811, which is in turn coupled to an internal shaft 2806disposed within the shaft 2804. The shaft 2804 is configured to have asmaller diameter than the internal diameter of screw extender housing,which is to be removed from the screw assembly. The lever 2811 ispivotally coupled to both the moving portion 2807 and the internal shaft2806. Upon squeezing of the portion 2807 of the handle 2802, the pivotalconnections of the lever 2811 rotate and push the internal shaft 2806along the interior of the shaft 2804 and away from the handle 2802. Thiscauses the distal end of the internal shaft 2806 to extend beyond thedistal end of the shaft 2804. Upon release of the portion 2807, theinternal shaft 2806 returns to its original position within the shaft2804.

The shaft 2804 further includes protrusions 2815 (a, b) disposed on itsouter circumference substantially adjacent the distal end of the shaft2804. The protrusions 2815 are configured to interact with flexibleindentor portions 240 (see, FIG. 2a ) upon insertion of the tool 2800into the screw extender housing 2820, as shown in FIGS. 28a-e . Theprotrusions 2815 are configured to push apart the flexible indentorportions 240 and thereby free screw extender housing from the lockedarrangement with the screw assembly 2830. Thus, to remove the screwextender tower/housing from the screw assembly, the tool 2800 isinserted into the screw extender housing until its distal end issubstantially adjacent the setscrew of the screw assembly, the tool 2800may be rotated so that the protrusions 2815 contact and subsequentlypush apart (i.e., away from the head of the screw assembly) the flexibleindentor portions 240, then the movable portion 2807 of the handle 2802is squeezed, thereby extending the internal shaft 2806 beyond the distalend of the shaft 2804 and pushing the internal shaft 2806 against thesetscrew of the screw assembly and removing the screw extender from thescrew assembly, as shown in FIGS. 28a-e . In some embodiments, the shaft2804 can be configured to include a stopper 2819 that contacts theproximal end of the screw extender housing upon insertion of the tool2800 and prevents over-insertion of the tool.

FIGS. 29a-f illustrate an exemplary rod inserter tool 2900 for insertinga connecting element through a diverging exposure of a soft tissue,which is created by the screw extenders, according to some embodimentsof the present invention. The tool 2900 includes a handle 2902, a mainhousing 2904, a secondary housing 2906, a lateral housing 2908, and aswitch 2910. The handle 2902 is disposed at the proximal end of the mainhousing 2904. The tool 2900 further includes a rod holding mechanism (orjaws) 2912 disposed at a distal end of the main housing 2904. The rodholding mechanism 2912 is configured to secure a rod 2950 while it isbeing inserted between two screw extender housings 2952 and 2954 thatare coupled to installed screws, as shown in FIGS. 29b-d . The mainhousing 2904 is disposed between the handle 2902 and the distal end ofthe tool 2900. The sub housing 2906 and the lateral housing 2908 areconfigured to be disposed along the main housing 2904. The tool 2900further includes a switching mechanism 2914 disposed at the proximal endof the tool 2900 and substantially adjacent to the main housing 2904 andthe handle 2902. The switching mechanism 2914 is further illustrated inFIGS. 29e-f . The switching mechanism 2914 is configured to release therod 2950 once it is installed between two screw extender housings 2952and 2954.

The rod holding mechanism 2912 is formed using distal ends of the mainhousing 2904, secondary housing 2906, and the lateral housing 2908. Thedistal end of the main housing 2904 includes an “L-shaped” grippingfeature 2918 that allows placement of the rod in a substantiallyvertical position with respect to the housings 2904, 2906, 2908, asshown in FIG. 29b . The distal end of the lateral housing 2908 isconfigured to push on a portion of the rod that is disposed adjacent tothe distal end of the lateral housing 2908 in order to rotate the rodinto a horizontal position, as shown in FIG. 29 d.

The housings 2904, 2906, and 2908 are configured to be internallycoupled to the handle 2902 and the switching mechanism 2914. The handle2902 is configured to be spring-loaded having a resistance spring thatallows return of the handle 2902 into an initial state after the userhas squeezed the handle 2902. The switching mechanism 2914 includes alever 2920 disposed on the handle 2902 substantially adjacent to theproximal end of the main housing 2902. The lever 2920 is furtherdisposed adjacent to a tab 2922. Rotation of the lever 2920 allowsrelease of the rod from the holding mechanism 2912. The lever 2920 isfurther interconnected with a holding pin 2944, as shown in FIGS. 29e-f. Upon rotation of the lever 2920 in a downward direction, as shown inFIG. 29e , the pin 2944 is configured to be pulled in an upwarddirection, thereby releasing the housing 2906 from a position, in whichit is configured to hold the rod 2950 (see, FIG. 29d ). Once the housing2906 is released, the user can pull on the tab 2922 to release the rod2950 from the tool 2900 (and vice versa).

The tool 2900 is configured to hold the rod 2950 at an almost verticalposition during insertion. The tool 2900 further allows manipulating therod horizontally once the rod is inserted through a small incision inthe skin of the patient to install the rod 2950 between two pediclescrews, as shown in FIGS. 29b-d . The tool 2900 allows its user (asurgeon or any other medical professional) to grip the rod 2950 mid-spanwithout requiring a special feature (e.g., a groove for clamping, etc.)to be placed on the rod. The tool 2900 further allows its user to placethe rod 2950 through an incision having a small opening but diverging asthe incision deepens. In some embodiments, the tool 2900 is configuredto combine two motions in different directions by squeezing the tool2900, i.e., it allows holding the rod in semi-vertical orientation andthen rotating it into a horizontal position for installation between twopedicle screws.

FIGS. 29b-d further illustrate procedure for inserting the rod 2950using the tool 2900. To install the rod 2950, the user loads the rod2950 into the tool 2900 by coupling the rod 2950 to the rod holdingmechanism 2912 located at the distal end of the tool 2900. To load therod 2950, the secondary housing 2906 is pulled back using the tab 2922and the rod 2950 is placed into the L-shaped gripping feature 2918. Thesecondary housing 2906 is configured to be spring-loaded (e.g., having aspring disposed inside the secondary housing) and is further configuredto return to its original position with respect to the main housing andtoward the loaded rod 2950. Once the secondary housing 2906 is returnedto its original position, the rod 2950 is secured at the distal end ofthe tool 2900. Thus, the rod 2950 is ready to be placed through theincision.

During insertion of the rod, the user may wish to rotate to rod to placeit into a horizontal position to secure it to the pedicle screws. Inorder to rotate the rod 2950, the user compresses the handle 2902.Handle compression actuates the lateral housing 2908, which causes thelateral housing 2908 to slide along the main housing 2902 toward thesecured rod 2950. The distal end of the lateral housing contacts the rod2950 and forces the rod to rotate into a substantially horizontalposition. During the rotation process, the main housing serves as afulcrum and continues to hold the rod 2950. Further, the secondaryhousing is configured to be pushed away from the rod and toward theproximal end of the secondary housing upon actuation of the lateralhousing and rotation of the rod. Thus, upon fully squeezing the handle2902, the rod 2950 is configured to rotate to a position that issubstantially perpendicular to the axis of the main housing.

Once the rod 2950 is secured to the pedicle screws, the rod is released.To release the rod 2950, the user rotates the switching mechanism fromits first position (loading position) to its second position (releasingposition), thereby locking the lateral housing 2908 and the secondarybody 2906 together. Upon locking the two housings together, the userreleases the handle 2902 and the rod 2950 remains in a horizontalposition and free from the secondary and lateral housings 2906, 2908. Atwhich point, the inserter tool 2900 can be removed from the incision. Tore-grip the rod 2950, the user can squeeze the handle 2902 and rotatethe switching mechanism in an opposite direction from its secondposition to its first position, thereby securing the rod 2950 to theholding mechanism.

In some embodiments, a surgeon can implement one or multiple toolsdiscussed above and shown in FIGS. 1a-29f in connection with a screwextender system and a screw assembly. In an exemplary procedure, apatient can be positioned prone, lying flat on a radiolucent table.Chest rolls may be used, but it is preferable to avoid knee-to chestpositions. Adequate clearance may be provided around the surgical tablefor use of a fluoroscopic C-arm. In some cases, preoperative planningmay determine proper pedicle targeting, including an appropriate entrypoint and trajectory. For pedicle targeting, fluoroscopic imaging can beused to verify anterior-posterior and lateral images of the spine toadequately delineate pedicle morphology and geometry. After identifyingpedicle entry point, a targeting needle is used to initiate the entrypoint. Entry angle and trajectory can be adjusted using fluoroscopicimaging until proper position is obtained. Once the targeting needle isin place, an inner stylet of the needle can be removed. The needle iscannulated to allow for placement of guidewire. The guidewire isinserted through the needle to a desired depth while observing that theguidewire does not cause any damage. Then, after the guidewire isinserted, the needle is removed. For the purposes of spreading apart thetissue and allowing placement of screw extender housing/towers andtools, variable-diameter dilators are advanced along the guidewire. Uponplacement of a larger diameter dilator, a smaller diameter dilator isremoved and a cannulated awl is placed over the guidewire through thelarger diameter dilator to breach the cortex at the pedicle entry point.The pedicle can be tapped using a cannulated tap tool once thecannulated awl is removed. This completes the pedicle preparation stageof the surgical procedure. At this time, the surgeon can begin insertionof the screw. The cannulated tap tool is removed and furtherlarger-diameter dilators are placed over the guidewire. As stated above,the screw extender housing is attached to a cannulated polyaxial screw(or any other type of suitable screw) prior to being installed on thechosen site. In some embodiments, a screw alignment guide tool can beused to attach the screw to the screw extender. Once the screw extenderis coupled to the screw, using a screw driver having an axial handle ora T-handle, the combination of the screw extender and the screw areplaced over the guidewire and through the attached dilator. The screw isthen inserted into the pedicle using the screw driver. After insertingthe screw into the pedicle, the screw driver and the dilator areremoved. The above procedure can be repeated for any subsequent screwsand screw extenders.

Once the screws with their respective screw extenders are installed atthe site, rod insertion procedure can be initiated. Using screw extendercalipers 3000 (such as those shown in FIG. 30) or any other suitabletool, length of the rod is determined. If calipers shown in FIG. 30 areused, then rod length can be indicated at the top of the calipers. Therod is then prepared based on these measurements.

A pathway between two installed screws is cleared using a known curvedand/or a sharp wand blade. Then, using a rod inserter (FIGS. 22a-b ), anend-holding rod inserter (FIGS. 24a-l ), the percutaneous end-holdingrod inserter (FIGS. 25a-e ), a rod inserter (FIGS. 29a-f ), or any otherrod inserter mechanisms/tools (e.g., FIGS. 19a-20o ) are used to advancethe rod along screw extenders toward the implanted screws.

In some embodiments, a rod reducer tool (FIGS. 21a-e, 27a-i ) can beused to provisionally secure the rod into place. Additionally,compression/distraction tools (FIGS. 13a-14e, 23a-i ) can be used toadjust distances/angles between screw extender towers.

After the distances/angles are determined, the rod is captured usingsetscrews that are placed through the screw extender assemblies using aknown setscrew inserter tool. The setscrews can be provisionallytightened to secure the rod in place. Then, using a known T-handletorque wrench with a torque wrench shaft and a screw extenderanti-torque handle 3100 (e.g., as shown in FIG. 31), the setscrews arefinally tightened. The anti-torque handle is coupled to a proximate endof the screw extender housing and the T-handle torque wrench is insertedinto the screw extender housing until it contacts the setscrew. Then,the T-handle torque wrench is turned (e.g., clockwise) to secure thesetscrew. In some embodiments, an audible indication (e.g., clicking)can alert the surgeon that the setscrews have been finally tightened.

To remove the screw extenders, screw extender remover tools (e.g., FIGS.18a-c, 28a-e ) are used to disengage the screw extender housing from theimplanted screw assembly. In some embodiments, an in-situ screw extenderre-attachment tool (e.g., FIGS. 26a-k ) can be used to re-attach thescrew extender housings to the screw assemblies.

In a typical surgery, a plurality of bone screws can be implanted usingthe methods and tools discussed in connection with and shown in FIGS. 1a-31. In some cases, once an appropriate number of screws have beenimplanted into the bony matter of a patient, a rod and/or wire canbridge gaps between the screws. Placement and manipulation of screws canbe accomplished using the extender devices and various surgical tools,as shown in FIGS. 1a -31. Following that, set screws can be tightenedand the guide wire can be removed. Typically, the guide wire is removedprior to use of the caliper tool is used. The extender device and use ofsurgical tools allows a surgeon (or other medical profession) to performa minimally invasive surgery of placing various fusion devices, such asin the case of spinal fusion procedures.

Although particular embodiments have been disclosed herein in detail,this has been done by way of example for purposes of illustration only,and is not intended to be limiting with respect to the scope of theappended claims, which follow. In particular, it is contemplated thatvarious substitutions, alterations, and modifications may be madewithout departing from the spirit and scope of the invention as definedby the claims. Other aspects, advantages, and modifications areconsidered to be within the scope of the following claims. The claimspresented are representative of the inventions disclosed herein. Other,unclaimed inventions are also contemplated. The applicant reserves theright to pursue such inventions in later claims.

What is claimed is:
 1. A tool configured to facilitate re-attaching ascrew extender to a screw assembly, the screw extender having a screwextender housing with a passageway, and a channel extending along alength of the housing from a proximal end to a distal end of thehousing, the channel being open to the passageway, the tool comprising:a removable shaft having a distal end configured to engage the screwassembly; and a main assembly having a main shaft, a handle and a hollowhousing, the main shaft having an interior channel, the handle disposedon a proximal end of the main shaft and the hollow housing disposed on adistal end of the main shaft, the main shaft configured to fit throughthe channel of the screw extender, and wherein the hollow housing isconfigured to receive the screw extender housing.
 2. The tool as setforth in claim 1, wherein a length of the main shaft between a distalend of the handle and a proximal end of the hollow housing is longerthan a length of the screw extender.
 3. The tool as set forth in claim1, wherein the hollow housing includes a pair of grooves disposed at thedistal end of the hollow housing, the pair of grooves being open to thedistal end of the hollow housing.
 4. The tool as set forth in claim 1,wherein the distal end of the removable shaft includes a peg.
 5. Thetool as set forth in claim 1, wherein the distal end of the removableshaft includes a threaded end.
 6. The tool as set forth in claim 5,wherein the proximal end of the removable shaft is configured toremovably receive a knob.
 7. The tool as set forth in claim 1, whereinthe main shaft has a flat surface.
 8. The tool as set forth in claim 1,wherein the handle is configured to receive the proximal end of theremovable shaft so as to hold the removable shaft in the interiorchannel of the main shaft and the hollow housing.
 9. A surgical kit forspinal procedures using a rod to secure adjacent vertebral bodies toeach other, the surgical kit comprising: a screw extender, the screwextender having a screw extender housing with a passageway, and achannel extending along a length of the housing from a proximal end to adistal end of the housing, the channel being open to the passageway; ascrew assembly having a screw and a set screw, the screw having athreaded shaft and a head having a pair of sidewalls spaced apart fromeach other so as to define a passageway, an interior surface of the pairof sidewalls having threads; a first removable shaft having a distal endconfigured to engage the screw assembly; a second removable shaft havinga distal end configured to engage the set screw; a main assembly havinga main shaft, a handle and a hollow housing, the main shaft having aninterior channel, the handle disposed on a proximal end of the mainshaft and the hollow housing disposed on a distal end of the main shaft,the main shaft configured to fit through the channel of the screwextender, and wherein the hollow housing is configured to receive thescrew extender housing.
 10. The surgical kit as set forth in claim 9,wherein a length of the main shaft between a distal end of the handleand a proximal end of the hollow housing is longer than a length of thescrew extender.
 11. The surgical kit as set forth in claim 9, whereinthe hollow housing includes a pair of grooves disposed at the distal endof the hollow housing, the pair of grooves being open to the distal endof the hollow housing.
 12. The surgical kit as set forth in claim 9,wherein the distal end of the second removable shaft includes a peg. 13.The surgical kit as set forth in claim 9, wherein the distal end of thefirst removable shaft includes a threaded end configured to engage thethreads of the pair of sidewalls.
 14. The surgical kit as set forth inclaim 9, wherein the proximal end of the first removable shaft and theproximal end of the second removable shaft are both configured toremovable receive a knob.
 15. The surgical kit as set forth in claim 9,wherein the main shaft has a flat surface.
 16. The surgical kit as setforth in claim 9, wherein hollow housing has a diameter that is largerthan a diameter of the screw extender.
 17. The surgical kit as set forthin claim 9, wherein the screw extender further includes a slot oppositethe channel so as to define a passageway for receiving the rod, a distalend of the slot open to the distal end of the housing and a proximal endof the slot closed by the housing.
 18. The surgical kit as set forth inclaim 9, wherein the hollow housing is dimensioned to fit over the headof the screw.